start-ver=1.4 cd-journal=joma no-vol=28 cd-vols= no-issue=1 article-no= start-page=1 end-page=25 dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=20220331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Depositional history of the Paleogene to Neogene valley fill deposits and topographic change in the Kibi Plateau region, Okayama City, Southwest Japan kn-title=岡山市北部吉備高原地域に分布する古第三系・新第三系の分布・堆積相と古地理変遷 en-subtitle= kn-subtitle= en-abstract=The deposition of the Paleogene to Neogene sediments in the Kibi Plateau region played an important role to form the Kibi Plateau Surface. Study area is situated in the southern part of the Kibi Plateau. Field work has been continued more than 30 years and traced distribution of the deposits which make clear the paleo-topography. Sedimentary facies of deposits were observed to understand depositional environments. Without Fission-Track zircon dating from tuff samples, we could not divide and define the formations. The Paleogene Kibi Group and the latest Paleogene to Neogene Bihoku Group are distributed in the study area. The Kibi Group is unusual deposits which filled steep valley in mountain area and comprise the Tomiyoshi Formation (36 to 34 Ma) and the Tsudaka Formation (29 to 27 Ma). The formations are fluvial deposits and have similar litho-facies. The distribution of the formations indicate drainage system when deposited. Conglomerates with imbricate structure are the major component of the formations and sandstones and mudstones (sometimes with plant fragments and rootlets) are associated. The Bihoku Group is composed of the fluvial Yagane Formation (24.5 to 25.5 Ma) and the shallow marine Nichiouji Formation (15 to 16 Ma). The formations have the same depositional basin of low relief valley. The Yagane Formation is composed of conglomerate, sandstone, mudstone and coaly mudstone. The Nichiouji Formation is composed of well sorted sandstone with marine fossils. kn-abstract= en-copyright= kn-copyright= en-aut-name=TanakaHajime en-aut-sei=Tanaka en-aut-mei=Hajime kn-aut-name=田中元 kn-aut-sei=田中 kn-aut-mei=元 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil=Seibu Engineering Consultants Co., Ltd. kn-affil=西部技術コンサルタント株式会社 affil-num=2 en-affil=Department of Earth Sciences, Okayama University kn-affil=岡山大学 特命教授・名誉教授 en-keyword=Kibi Plateau Surface kn-keyword=Kibi Plateau Surface en-keyword=Paleogene kn-keyword=Paleogene en-keyword=Kibi Group kn-keyword=Kibi Group en-keyword=Miocene kn-keyword=Miocene en-keyword=Bihoku Group kn-keyword=Bihoku Group END start-ver=1.4 cd-journal=joma no-vol=27 cd-vols= no-issue=1 article-no= start-page=19 end-page=27 dt-received= dt-revised= dt-accepted= dt-pub-year=2021 dt-pub=20210331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=The Kibi Plateau Surface ― relationship with the Paleogene and Miocene deposits in middle western part of Okayama Prefecture, Japan ― kn-title=新・古第三系の分布に着目した岡山県中西部における 吉備高原地域の地形特性 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The Kibi Plateau Surface is associated with the Paleogene gravel river bed deposits of the Kibi Group and the Miocene marine deposits of the Katsuta Group and the Bihoku Group. These Paleogene and Miocene units are valley fill deposits. The Kibi Group is composed of formations which is deposited by more than 7 different depositional events during earliest to latest Paleogene Period. Repeated cycles of “erosion - formation of new valley system - deposition and fill up the valley” created the low relief topographic surface. The deposition of the Miocene deposits might complete the Kibi Plateau Surface. Detailed field works have done in middle western part of Okayama Prefecture. The Kibi Plateau Surface in study area is gently dipping from NW (about 600m high) to SE (about 100m high). The distributions of the Paleogene and Miocene deposits fit the surface. At the southern margin of the Kibi Plateau, the surface is a little inclined (from 400m high to 100m high) where the bottom of paleo-valleys of the Paleogene deposits are subparallel to the surface. It suggests that the gentle tilting of the Kibi Plateau is caused by an up-warping. en-copyright= kn-copyright= en-aut-name=TanakaHajime en-aut-sei=Tanaka en-aut-mei=Hajime kn-aut-name=田中元 kn-aut-sei=田中 kn-aut-mei=元 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil=Fukken Co., Ltd., Okayama branch office kn-affil=復建調査設計株式会社岡山支社 affil-num=2 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=岡山大学大学院自然科学研究科 en-keyword=Kibi Plateau Surface kn-keyword=Kibi Plateau Surface en-keyword=Paleogene kn-keyword=Paleogene en-keyword=Neogene kn-keyword=Neogene en-keyword=Miocene kn-keyword=Miocene END start-ver=1.4 cd-journal=joma no-vol=26 cd-vols= no-issue=1 article-no= start-page=19 end-page=24 dt-received= dt-revised= dt-accepted= dt-pub-year=2019 dt-pub=20191227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Schistose fault related rocks from the Sangun Metamorphic Rocks, Kawakita area, Misaki Town, Okayama Prefecture, SW Japan kn-title=美咲町川北地域に分布する三郡変成岩から見出された片岩化した断層岩 en-subtitle= kn-subtitle= en-abstract= kn-abstract= The crystalline schist which is representatively exposed in the Innerside of Southwest Japan is called the Sangun Metamorphic Rocks (SMR). In Kawakita area, Misaki Town, Okayama Prefecture, schistose fault rocks which is newly described in below are intercalated in the SMR. The rocks are composed of lenticular fragments of pelitic, basic siliceous rocks and quartz vein with siliceous to pelitic matrix. The fine-grained muscovites which define schistosity penetrate the rocks. Major direction of layer which though to reflect slip plane is subparallel to the schistosity. The long axis of some fragments are slightly oblique to the schistosity. The combination of the two sets of planes is considered to be a composite planar fabric. These occurrences suggest that the rocks are fault rock before the Sangun Metamorphism and named as schistose fault rocks. Lenses of cataclasite and myronite are accompanied. Planar thin (about 10cm in thickness) brittle fault rock is also associated. These shear deformed rocks form units of layer (shear zone) of 10 to 100m in thickness, and are concordantly intercalated in the surrounded normal schists. Active periods of the shear zones had several times from before and after the event of the Sangun Metamorphism. en-copyright= kn-copyright= en-aut-name=MATSUSHITAMirei en-aut-sei=MATSUSHITA en-aut-mei=Mirei kn-aut-name=松下実礼 kn-aut-sei=松下 kn-aut-mei=実礼 aut-affil-num=1 ORCID= en-aut-name=SUZUKIShigeyuki en-aut-sei=SUZUKI en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=岡山大学大学院自然科学研究科 affil-num=2 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=岡山大学大学院自然科学研究科 en-keyword=Sangun Metamorphic Rocks kn-keyword=Sangun Metamorphic Rocks en-keyword=regional metamorphism kn-keyword=regional metamorphism en-keyword=shear deformation kn-keyword=shear deformation en-keyword=schistose fault rock kn-keyword=schistose fault rock END start-ver=1.4 cd-journal=joma no-vol=2017 cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2019 dt-pub=20190329 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Bulletin of Archaeological Research Center Okayama University 2017 kn-title=岡山大学埋蔵文化財調査研究センター紀要2017 en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name=NozakiTakahiro en-aut-sei=Nozaki en-aut-mei=Takahiro kn-aut-name=野崎貴博 kn-aut-sei=野崎 kn-aut-mei=貴博 aut-affil-num=1 ORCID= en-aut-name=MinamiKentaro en-aut-sei=Minami en-aut-mei=Kentaro kn-aut-name=南健太郎 kn-aut-sei=南 kn-aut-mei=健太郎 aut-affil-num=2 ORCID= en-aut-name=YamamotoEtsuyo en-aut-sei=Yamamoto en-aut-mei=Etsuyo kn-aut-name=山本悦世 kn-aut-sei=山本 kn-aut-mei=悦世 aut-affil-num=3 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=4 ORCID= en-aut-name=YamaguchiYuji en-aut-sei=Yamaguchi en-aut-mei=Yuji kn-aut-name=山口雄治 kn-aut-sei=山口 kn-aut-mei=雄治 aut-affil-num=5 ORCID= en-aut-name=IwasakiShiho en-aut-sei=Iwasaki en-aut-mei=Shiho kn-aut-name=岩ア志保 kn-aut-sei=岩ア kn-aut-mei=志保 aut-affil-num=6 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=古環境センター kn-aut-sei=古環境センター kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=吉田生物研究所 kn-aut-sei=吉田生物研究所 kn-aut-mei= aut-affil-num=8 ORCID= affil-num=1 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=2 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=3 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=4 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学 affil-num=5 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=6 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=7 en-affil= kn-affil= affil-num=8 en-affil= kn-affil= END start-ver=1.4 cd-journal=joma no-vol=25 cd-vols= no-issue=1 article-no= start-page=39 end-page=48 dt-received= dt-revised= dt-accepted= dt-pub-year=2018 dt-pub=20181227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=U-Pb single grain zircon ages for Sanbagawa Metamorphic Rocks in central Shikoku (Japan): the Sanbagawa Belt re-united en-subtitle= kn-subtitle= en-abstract= kn-abstract= The high-P/low-T Sanbagawa Metamorphic Belt that traverses SW Japan, has been subdivided into two belts thought to have been metamorphosed at ca. 120 Ma and at ca. 65 Ma (‘Sanbagawa Metamorphic Rocks’ and ‘Shimanto Metamorphic Rocks’). The subdivision was based on the assumption that metamorphism occurred at ca. 116 Ma, largely based on an early Rb-Sr isotope study and zircon data obtained for the eclogite unit of the Sanbagawa Belt, whereas in some parts of the belt detrital zircons of late Cretaceous age (90-80 Ma) were discovered. Analysis of detrital zircons sampled from two sites within the area considered to expose the older ‘Sanbagawa Metamorphic Rocks’, including the area investigated by the Rb-Sr study, reveals the presence of zircons younger than 95 Ma in all samples and some grains as young as 80 ± 4 Ma. It is therefore concluded that the Sanbagawa Belt is one single tectonic entity that formed in the Late Cretaceous though it contains older components, including fossiliferous clasts, older basic meta-volcanics and eclogite units that may record earlier metamorphic events. en-copyright= kn-copyright= en-aut-name=KnittelUlrich en-aut-sei=Knittel en-aut-mei=Ulrich kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=WaliaMonika en-aut-sei=Walia en-aut-mei=Monika kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=LeeYuan-Hsi en-aut-sei=Lee en-aut-mei=Yuan-Hsi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil=Clay and Interface Mineralogy, RWTH Aachen University kn-affil= affil-num=2 en-affil=Department of Geosciences, National Taiwan University kn-affil= affil-num=3 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=4 en-affil=Department of Earth and Environmental Sciences, National Chung-Cheng University kn-affil= en-keyword=U-Pb zircon dating kn-keyword=U-Pb zircon dating en-keyword=Sanbagawa Metamorphic Belt kn-keyword=Sanbagawa Metamorphic Belt en-keyword=Late Cretaceous kn-keyword=Late Cretaceous en-keyword=Asemi River kn-keyword=Asemi River END start-ver=1.4 cd-journal=joma no-vol=25 cd-vols= no-issue=1 article-no= start-page=31 end-page=38 dt-received= dt-revised= dt-accepted= dt-pub-year=2018 dt-pub=20181227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A new method of terrace analysis to determine precise altitudes of former shoreline en-subtitle= kn-subtitle= en-abstract= kn-abstract= The study area is situated in Japan Sea side margin of the Shakotan Peninsula, Hokkaido, Japan, where MIS5e Terrace is preserved along the cost. Numbers of tight drilling have done to establish new method for terrace analysis. Buried wave cut terrace and sea cliff (when the MIS5e Terrace was formed) are reconstructed by distribution of the terrace deposits and these bottom of unconformity planes. The precise site and altitude of former shoreline was also obtained. Altitudes of the former shoreline from the 7 sections are almost the same 22 to 27m in height. Previous data of the height of shoreline are obtained from the topographic MIS5e Terrace surface. The altitudes have variation from 30m to 60m. It suggests that the traditional method for the MIS5e terrace analysis had some errors in the study area. en-copyright= kn-copyright= en-aut-name=AmanoHideki en-aut-sei=Amano en-aut-mei=Hideki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=SatoMasaru en-aut-sei=Sato en-aut-mei=Masaru kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=YanagidaMakoto en-aut-sei=Yanagida en-aut-mei=Makoto kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=3 en-affil=Hanshin Consultants Co., Ltd., kn-affil= affil-num=4 en-affil=Hanshin Consultants Co., Ltd., kn-affil= en-keyword=MIS5e kn-keyword=MIS5e en-keyword=marine terrace kn-keyword=marine terrace en-keyword=terrace deposits kn-keyword=terrace deposits en-keyword=tight drilling kn-keyword=tight drilling en-keyword=shoreline kn-keyword=shoreline END start-ver=1.4 cd-journal=joma no-vol=25 cd-vols= no-issue=1 article-no= start-page=1 end-page=5 dt-received= dt-revised= dt-accepted= dt-pub-year=2018 dt-pub=20181227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Non-calcareous beachrock found in Akagurisaki, Ohi Town, Fukui Prefecture kn-title=福井県おおい町赤礁崎で見出された非石灰質ビーチロック en-subtitle= kn-subtitle= en-abstract= kn-abstract= Beachrock which was formed about 0.5 meter higher than high tide is found in Akagurisaki, Ohi Town, Fukui Prefecture. The outcrops always get wet by spring water. The sediments are composed of well sorted rounded gravels and sands but calcareous shell is not found at all. Intergranular space is occupied by white amorphous cement. Magnesium and silicon rich composition of the cement is obtained by EPMA analysis. There is a conjecture that the magnesium rich cement was precipitated in spite of solution of calcareous shell under saturated state by spring water, because calcium has a higher tendency to ionize than magnesium. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= en-aut-name=AzumaYoichi en-aut-sei=Azuma en-aut-mei=Yoichi kn-aut-name=東洋一 kn-aut-sei=東 kn-aut-mei=洋一 aut-affil-num=2 ORCID= en-aut-name=DeyamaYasuyo en-aut-sei=Deyama en-aut-mei=Yasuyo kn-aut-name=出山康代 kn-aut-sei=出山 kn-aut-mei=康代 aut-affil-num=3 ORCID= en-aut-name=YukawaHirokazu en-aut-sei=Yukawa en-aut-mei=Hirokazu kn-aut-name=湯川弘一 kn-aut-sei=湯川 kn-aut-mei=弘一 aut-affil-num=4 ORCID= en-aut-name=UsuiMayumi en-aut-sei=Usui en-aut-mei=Mayumi kn-aut-name=臼井まゆみ kn-aut-sei=臼井 kn-aut-mei=まゆみ aut-affil-num=5 ORCID= affil-num=1 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=岡山大学大学院自然科学研究科 affil-num=2 en-affil=平寺町松岡兼定島 4-1-1 ** kn-affil=福井県立大学恐竜学研究所 affil-num=3 en-affil=平寺町松岡兼定島 4-1-1 ** kn-affil=福井県立大学恐竜学研究所 affil-num=4 en-affil=Fukui Prefectural Dinosaur Museum kn-affil=福井県立恐竜博物館 affil-num=5 en-affil=Fujigakuin-Okayama kn-affil=富士学院 en-keyword=Beachrock kn-keyword=Beachrock en-keyword=Akagurisaki kn-keyword=Akagurisaki en-keyword=non-calcareous cement kn-keyword=non-calcareous cement en-keyword=ionization tendency kn-keyword=ionization tendency END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page=1 end-page=7 dt-received= dt-revised= dt-accepted= dt-pub-year=2018 dt-pub=201802 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=縄文時代の海岸線復元と遺跡動態 : 岡山平野のボーリング調査を踏まえて en-subtitle= kn-subtitle= en-abstract= kn-abstract=瀬戸内沿岸における縄文時代の人間活動を理解するためには、古地形復元と遺跡動態との関連を分析することが重要な視点となる。その第一歩として、同地域で有数の縄文遺跡密集地である岡山平野において、ボーリングコアを採取する調査を実施し、その地質調査から、特に海岸線に現れる環境変化の復元を試みた。その結果、縄文海進のピーク以降も、相対的な海水準変動が海岸線の変化をもたらし、人間活動に影響を与えた可能性が、遺跡動態の検討からも予想されることとなった。 en-copyright= kn-copyright= en-aut-name=YamamotoEtsuyo en-aut-sei=Yamamoto en-aut-mei=Etsuyo kn-aut-name=山本悦世 kn-aut-sei=山本 kn-aut-mei=悦世 aut-affil-num=1 ORCID= en-aut-name=YamaguchiYuji en-aut-sei=Yamaguchi en-aut-mei=Yuji kn-aut-name=山口雄治 kn-aut-sei=山口 kn-aut-mei=雄治 aut-affil-num=2 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= affil-num=1 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=2 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=3 en-affil= kn-affil=岡山大学大学院自然科学研究科 END start-ver=1.4 cd-journal=joma no-vol=2016 cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2018 dt-pub=20180328 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Bulletin of Archaeological Research Center Okayama University 2016 kn-title=岡山大学埋蔵文化財調査研究センター紀要2016 en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name=YamaguchiYuji en-aut-sei=Yamaguchi en-aut-mei=Yuji kn-aut-name=山口雄治 kn-aut-sei=山口 kn-aut-mei=雄治 aut-affil-num=1 ORCID= en-aut-name=YamamotoEtsuyo en-aut-sei=Yamamoto en-aut-mei=Etsuyo kn-aut-name=山本悦世 kn-aut-sei=山本 kn-aut-mei=悦世 aut-affil-num=2 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= en-aut-name=IwasakiShiho en-aut-sei=Iwasaki en-aut-mei=Shiho kn-aut-name=岩ア志保 kn-aut-sei=岩ア kn-aut-mei=志保 aut-affil-num=4 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=白石純 kn-aut-sei=白石 kn-aut-mei=純 aut-affil-num=5 ORCID= en-aut-name=MinamiKentaro en-aut-sei=Minami en-aut-mei=Kentaro kn-aut-name=南健太郎 kn-aut-sei=南 kn-aut-mei=健太郎 aut-affil-num=6 ORCID= en-aut-name=NozakiTakahiro en-aut-sei=Nozaki en-aut-mei=Takahiro kn-aut-name=野崎貴博 kn-aut-sei=野崎 kn-aut-mei=貴博 aut-affil-num=7 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=佐藤朗 kn-aut-sei=佐藤 kn-aut-mei=朗 aut-affil-num=8 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=二宮和彦 kn-aut-sei=二宮 kn-aut-mei=和彦 aut-affil-num=9 ORCID= affil-num=1 en-affil= Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=2 en-affil=Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=3 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=岡山大学大学院自然科学研究科 affil-num=4 en-affil=Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=5 en-affil= kn-affil=岡山理科大学 affil-num=6 en-affil=Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=7 en-affil=Archaeological Research Center, Okayama University kn-affil=岡山大学埋蔵文化財調査研究センター affil-num=8 en-affil= kn-affil=大阪大学大学院理学研究科 affil-num=9 en-affil= kn-affil=大阪大学大学院理学研究科 END start-ver=1.4 cd-journal=joma no-vol=23 cd-vols= no-issue=1 article-no= start-page=9 end-page=15 dt-received= dt-revised= dt-accepted= dt-pub-year=2016 dt-pub=20161227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Prelithification shear structures of m?lange unit in Shiofuki-iwa area, the upper Cretaceous Shimanto Belt, Wakayama Prefecture, Japan en-subtitle= kn-subtitle= en-abstract= kn-abstract= Analyzing of sedimentary facies and structure together with regional field mapping were studied in the m?lange unit, upper Cretaceous Shimanto Belt, Wakayama Pref., SW Japan. The field survey was concentrated in the coast of Shiofuki-iwa, Miyama Complex, Hidakagawa Belt where soft deformations penetrate throughout the m?lange unit. Brittle to ductile faults associated as later deformations are excluded. The m?lange unit is subdivided into the Y-shear zone (YSZ) and P-foliation zone (PFZ). The YSZ is composed of thick lenticular sandstone (trends subparallel to the direction of the m?lange), intense shear band (thin layer with concentrated prelithification shear deformation) and mudstone dominant m?lange. The PFZ is composed of mudstone dominant m?lange (associated with foliations which slightly oblique to the direction of the YSZ) and lenticular sandstone (slightly oblique to the direction of the YSZ). The intense shear band separates the YSZ and PFZ. Preserved radiolarian fossils free from deformation in the intense shear band is the evidence of the prelithification shear deformation in the m?lange. A remarkable-fact is that the structures of m?lange unit are formed under sinistral sense of shear. The m?lange unit in the Shiofuki-iwa is ascribed to be formed by sinistral sense of shear during sediments were prelithified. en-copyright= kn-copyright= en-aut-name=TakesueNorito en-aut-sei=Takesue en-aut-mei=Norito kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= affil-num=1 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= en-keyword=m?lange kn-keyword=m?lange en-keyword=Shimanto Belt kn-keyword=Shimanto Belt en-keyword=Y-shear zone kn-keyword=Y-shear zone en-keyword=P-foliation zone kn-keyword=P-foliation zone en-keyword=intense shear band kn-keyword=intense shear band en-keyword=prelithification structures kn-keyword=prelithification structures END start-ver=1.4 cd-journal=joma no-vol=23 cd-vols= no-issue=1 article-no= start-page=1 end-page=7 dt-received= dt-revised= dt-accepted= dt-pub-year=2016 dt-pub=20161227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Risk prediction of landslide and debris flow using slope gradation map obtained from airborne laser scanning kn-title=航空レーザ傾斜量図を用いた斜面・土石流危険箇所抽出の試み en-subtitle= kn-subtitle= en-abstract= kn-abstract= The slope gradation map which is obtained from airborne laser scanning is very important tool to detect hazardous sites of landslide, debris flow and others. The features of the images (what the images are represented) in the map were confirmed by field survey. The study area, Tamagashi is situated in the Kibi Plateau area, Okayama City, Japan. The map helps to distinguish between artificial microrelief and natural microtopography very well. Small scarps (even 0.5m high), rocky cliffs and large blocks (larger than 2m) are identified in the map. The detail images of the microrelief suggest threatening sites. The merit of the map leads us to find the site in the field easily. We will not miss the threatening sites by using the map. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= en-aut-name=MiyashitaMasashi en-aut-sei=Miyashita en-aut-mei=Masashi kn-aut-name=宮下征士 kn-aut-sei=宮下 kn-aut-mei=征士 aut-affil-num=2 ORCID= en-aut-name=HirakawaTakeshi en-aut-sei=Hirakawa en-aut-mei=Takeshi kn-aut-name=平川武 kn-aut-sei=平川 kn-aut-mei=武 aut-affil-num=3 ORCID= en-aut-name=FujiwaraMieko en-aut-sei=Fujiwara en-aut-mei=Mieko kn-aut-name=藤原身江子 kn-aut-sei=藤原 kn-aut-mei=身江子 aut-affil-num=4 ORCID= en-aut-name=NishiyamaSatoshi en-aut-sei=Nishiyama en-aut-mei=Satoshi kn-aut-name=西山哲 kn-aut-sei=西山 kn-aut-mei=哲 aut-affil-num=5 ORCID= affil-num=1 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil=岡山大学大学院自然科学研究科 affil-num=2 en-affil=WESCO co. kn-affil=株式会社ウエスコ affil-num=3 en-affil=WESCO co. kn-affil=株式会社ウエスコ affil-num=4 en-affil=WESCO co. kn-affil=株式会社ウエスコ affil-num=5 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil=岡山大学大学院環境生命科学研究科 en-keyword=Risk prediction kn-keyword=Risk prediction en-keyword=slope gradation map kn-keyword=slope gradation map en-keyword=airborne laser scanning kn-keyword=airborne laser scanning en-keyword= landslide kn-keyword= landslide en-keyword=debris flow kn-keyword=debris flow en-keyword=Okayama kn-keyword=Okayama END start-ver=1.4 cd-journal=joma no-vol=22 cd-vols= no-issue=1 article-no= start-page=31 end-page=39 dt-received= dt-revised= dt-accepted= dt-pub-year=2015 dt-pub=20151227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Facies analysis of the Jito Formation ( Upper Triassic Nariwa Group ) in Jito Area, Kawakami, Okayama Pref., SWJapan. kn-title=岡山県川上町地頭地域における上部三畳系成羽層群地頭層の層相解析 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Facies analysis and analysis of stratigraphy together with folded structure of the Norian Jito Formation were studied in Jito Area, Kawakami, Okayama Pref., SW Japan. Results of regional mapping and measured sections reconstruct three-dimensionally distribution of the Jito Formation. The Jito Formation is sub-divided into the four new members; the Shimohira Muddy Sandstone Member, the Otofuji Coarse-grained Turbidite Member, the Misawa Fine-grained Turbidaite Member, and the Ide Conglomerate Sandstone Member in ascending order. The shimohira Muddy Sandstone Member is interpreted to be deposited in an inner-bay. The Otofuji Coarse-grained Turbidite Member and The Misawa Fine-grained Turbidite Member are considered to be deposited on a continental shelf. The Ide Conglomerate Sandstone Member is inferred to be a shallow marine deposit. As a result, the Jito Formation is regarded as one transgressive-regressive package. en-copyright= kn-copyright= en-aut-name=MasaokaYuto en-aut-sei=Masaoka en-aut-mei=Yuto kn-aut-name=正岡祐人 kn-aut-sei=正岡 kn-aut-mei=祐人 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学大学院自然科学研究科 affil-num=2 en-affil= kn-affil=岡山大学大学院自然科学研究 en-keyword=Jito Formation kn-keyword=Jito Formation en-keyword=Nariwa Group kn-keyword=Nariwa Group en-keyword=Norian kn-keyword=Norian en-keyword=facies analysis kn-keyword=facies analysis en-keyword=turbidite kn-keyword=turbidite END start-ver=1.4 cd-journal=joma no-vol=22 cd-vols= no-issue=1 article-no= start-page=25 end-page=30 dt-received= dt-revised= dt-accepted= dt-pub-year=2015 dt-pub=20151227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Petrography of foundation stones of the Bizen Kokubunji Temple, Okayama Prefecture, Japan ―an attempt to identify their collected site― kn-title=備前国分寺礎石の岩石特徴と産地の推定 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The Bizen Kokubunji Temple was constructed in the 8th century, in Maya, Akaiwa City, Okayama. Only foundation stones are preserved. Geological characteristics of the foundation stones suggest that they are collected from mountain area of Maya, about 300 to 800m west from the site. The similarity of the foundation stones and the rocks Maya are identified by the following characteristics. 1) Assemblage of rock types (high grade welded tuff breccia, tuff breccia, tuffaceous sandstone and conglomerate) are the same. 2) Lithology of the 3 rock type of the foundation stones and the rocks from Maya are the same. 3) Rheomorphic flow structures are developed in both high grade welded tuff breccia. 4)Mudstone fragments are contained in both high grade welded tuff breccia tuff breccia. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= en-aut-name=NishimuraNorihide en-aut-sei=Nishimura en-aut-mei=Norihide kn-aut-name=西村仁秀 kn-aut-sei=西村 kn-aut-mei=仁秀 aut-affil-num=2 ORCID= en-aut-name=ArigaYuji en-aut-sei=Ariga en-aut-mei=Yuji kn-aut-name=有賀祐史 kn-aut-sei=有賀 kn-aut-mei=祐史 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学大学院自然科学研究 affil-num=2 en-affil= kn-affil=応用地質株式会社 affil-num=3 en-affil= kn-affil=岡山県赤磐市教育委員会 en-keyword=Bizen Kokubunji Temple kn-keyword=Bizen Kokubunji Temple en-keyword=foundation stone kn-keyword=foundation stone en-keyword=collected site kn-keyword=collected site en-keyword=Okayama kn-keyword=Okayama END start-ver=1.4 cd-journal=joma no-vol=21 cd-vols= no-issue=1 article-no= start-page=7 end-page=11 dt-received= dt-revised= dt-accepted= dt-pub-year=2014 dt-pub=20141227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Paleoparadoxia from the middle Miocene of Obara, Misaki-cho, Okayama Prefecture, Japan kn-title=岡山県美咲町小原周辺に分布する中部中新統からのPaleoparadoxiaの産出報告 en-subtitle= kn-subtitle= en-abstract= kn-abstract= The partially preserved left humerus of the Desmostylia (Mammalia) has been collected from the riverbed in Obara, Misaki-cho, Okayama Prefecture in the western Japan. This specimen can be classified to the genus Paleoparadoxia by the following features: the absence of the supratrochlear foramen; the curved disto-lateral border of the shaft in the antero-posterior view; the medio-laterally expanded flat trochlea of humerus. Moreover, this specimen can be referred to cf. P. media on the basis of its middle-sized dimensions. This is the second occurrence of Palaeoparadoxia from Okayama Prefecture. en-copyright= kn-copyright= en-aut-name=FukuchiAkira en-aut-sei=Fukuchi en-aut-mei=Akira kn-aut-name=福地亮 kn-aut-sei=福地 kn-aut-mei=亮 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=株式会社 阪神コンサルタンツ 川内調査事務所 affil-num=2 en-affil= kn-affil=岡山大学大学院自然科学研究科 en-keyword=Middle Miocene kn-keyword=Middle Miocene en-keyword=mammal kn-keyword=mammal en-keyword=Desmostylia kn-keyword=Desmostylia en-keyword=Paleoparadoxia kn-keyword=Paleoparadoxia END start-ver=1.4 cd-journal=joma no-vol=35 cd-vols= no-issue= article-no= start-page=8 end-page=13 dt-received= dt-revised= dt-accepted= dt-pub-year=2014 dt-pub=201402 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=活断層調査の方法と断層活動の特徴 en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学自然科学研究科 END start-ver=1.4 cd-journal=joma no-vol=2012 cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2013 dt-pub=20131227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Bulletin of Archaelogical Research Center Okayama University 2012 kn-title=岡山大学埋蔵文化財調査研究センター紀要2012 en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=野崎貴博 kn-aut-sei=野崎 kn-aut-mei=貴博 aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=岩崎志保 kn-aut-sei=岩崎 kn-aut-mei=志保 aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=山本悦世 kn-aut-sei=山本 kn-aut-mei=悦世 aut-affil-num=4 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=南健太郎 kn-aut-sei=南 kn-aut-mei=健太郎 aut-affil-num=5 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=田中克典 kn-aut-sei=田中 kn-aut-mei=克典 aut-affil-num=6 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=加藤鎌司 kn-aut-sei=加藤 kn-aut-mei=鎌司 aut-affil-num=7 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 affil-num=5 en-affil= kn-affil=岡山大学 affil-num=6 en-affil= kn-affil= affil-num=7 en-affil= kn-affil=岡山大学 END start-ver=1.4 cd-journal=joma no-vol=20 cd-vols= no-issue=1 article-no= start-page=7 end-page=11 dt-received= dt-revised= dt-accepted= dt-pub-year=2013 dt-pub=20131227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=On Periploma mitsuganoense Araki (Bivalvia: Mollusca) from the Miocene Bihoku Group in Niimi City, Okayama Prefecture, southwest Japan ―with special reference to it’s paleogeographic significance― kn-title=岡山県新見市の中新世備北層群からのPeriploma mitsuganoense Araki (Bivalvia: Mollusca)について ―特にその古地理学的意義― en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this paper, we deal with re-description of Periploma mitsuganoense Araki and it’s morphological variation and significance of the molluscan fauna of it from the Miocene Bihoku Group in Niimi City, Okayama Prefecture, Southwest Japan. Moreover, the paleogeographic significance of this species is analyzed. The obtained results are summarized as follows: 1. The morphological variation of Periploma mitsuganoense Araki has a wide range on the basis of the analysis of the morphological outline. 2. The occurrence of P. mitsuganoense Araki from the Pectinid fauna is the first record in the West Setouchi Geological Province. 3. It is presumable that P. mitsuganoense Araki is an endemic species in the First Setouchi Geological Province from a view point of it’s spatial distribution. en-copyright= kn-copyright= en-aut-name=TaguchciEiji en-aut-sei=Taguchci en-aut-mei=Eiji kn-aut-name=田口栄次 kn-aut-sei=田口 kn-aut-mei=栄次 aut-affil-num=1 ORCID= en-aut-name=KishimotoShingo en-aut-sei=Kishimoto en-aut-mei=Shingo kn-aut-name=岸本眞五 kn-aut-sei=岸本 kn-aut-mei=眞五 aut-affil-num=2 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil= affil-num=2 en-affil= kn-affil= affil-num=3 en-affil= kn-affil=岡山大学理学部地球科学科 en-keyword=Periploma mitsuganoense Araki kn-keyword=Periploma mitsuganoense Araki en-keyword=Mollusca kn-keyword=Mollusca en-keyword=Miocene kn-keyword=Miocene en-keyword=Bihoku Group kn-keyword=Bihoku Group en-keyword=morphological variation kn-keyword=morphological variation en-keyword=paleogeographic significance kn-keyword=paleogeographic significance END start-ver=1.4 cd-journal=joma no-vol=20 cd-vols= no-issue=1 article-no= start-page=1 end-page=6 dt-received= dt-revised= dt-accepted= dt-pub-year=2013 dt-pub=20131227 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture kn-title=岡山県倉敷市北村地域で発生した土石流災害の特徴と要因 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The debris avalanche occurred in Kitamura area, Kurashiki City, Okayama Prefecture caused by the hard rain of Typhoon 12 of September, 2011. Furthermore, 11 small landslides occurred in the study area. In this area, the altitude of mountainous are not so high (150m to 250m) and the amount of precipitation which producted the debris avalanche was not very serious quantity with 230mm. However the debris avalanche occurred. One private house collapsed, and the first floor part of the Kitamura Elementary School was buried due to the debris flow. The purpose of this study is to examine causes of the debris avalanche disaster occurred in Kitamura area using applied geological technique. The length of the debris avalanche scar is about 250m, and alluvial fan is formed as a debris slope. The ground is composed of weathered granite and the bottom of the valley was filled by soils derived from disintegrated granite. There are three small landslides as head scarps with steep slopes at approximately 30°-35°. The debris avalanche was inferred to have started as a shallow soil slip at the head by rainfall. 3 major causes are inferred which originated the debris avalanche in the study area; steep slope, ground composed of weathered granite, existence of sandy soil which occupied at the bottom of valley. en-copyright= kn-copyright= en-aut-name=KimuraYuki en-aut-sei=Kimura en-aut-mei=Yuki kn-aut-name=木村裕貴 kn-aut-sei=木村 kn-aut-mei=裕貴 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学理学部地球科学科 affil-num=2 en-affil= kn-affil=岡山大学理学部地球科学科 en-keyword=debris avalanche kn-keyword=debris avalanche en-keyword=steep slope kn-keyword=steep slope en-keyword=weathered granite kn-keyword=weathered granite END start-ver=1.4 cd-journal=joma no-vol=19 cd-vols= no-issue=1 article-no= start-page=25 end-page=37 dt-received= dt-revised= dt-accepted= dt-pub-year=2012 dt-pub=20121226 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=The oldest fossil forest in Japan discovered from the Upper Triassic Nariwa Group, Okayama Prefecture, SW Japan -Implication for reconstruction of depositional environment and paleovegetation- kn-title=上部三畳系成羽層群における 日本最古の化石林の発見 ―堆積環境復元および古植生復元における意義― en-subtitle= kn-subtitle= en-abstract= kn-abstract=Erect fossil stumps were found from the outcrop of the Upper Triassic Hinabata Formation, the uppermost part of the Nariwa Group at Hinabata, Nariwa-cho,Takahashi City, Okayama Prefecture, SW Japan. They are evidence of the oldest fossil forest in Japan. The Upper Triassic Nariwa Group is mostly composed of non-marine deposits except the marine Jito Formation and characterized by the abundance in plant fossils. The marine Jito Formation is characterized by occurrence of Norian Monotis ochotica. On the basis of detailed observation of the occurrence of erect fossil stumps, as well as sedimentary facies of fossil-bearing unit, the fossil forest was interpreted to have grown on the top of the natural-levee units. One of the erect fossil stumps was identified as Xenoxylon sp. en-copyright= kn-copyright= en-aut-name=YukawaHirokazu en-aut-sei=Yukawa en-aut-mei=Hirokazu kn-aut-name=湯川弘一 kn-aut-sei=湯川 kn-aut-mei=弘一 aut-affil-num=1 ORCID= en-aut-name=TeradaKazuo en-aut-sei=Terada en-aut-mei=Kazuo kn-aut-name=寺田和雄 kn-aut-sei=寺田 kn-aut-mei=和雄 aut-affil-num=2 ORCID= en-aut-name=SunGe en-aut-sei=Sun en-aut-mei=Ge kn-aut-name=孫革 kn-aut-sei=孫 kn-aut-mei=革 aut-affil-num=3 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学大学院自然科学研究科 affil-num=2 en-affil= kn-affil=福井県立恐竜博物館 affil-num=3 en-affil= kn-affil=遼寧古生物博物館 affil-num=4 en-affil= kn-affil=岡山大学大学院自然科学研究科 en-keyword=erect fossil stump kn-keyword=erect fossil stump en-keyword=fossil forest kn-keyword=fossil forest en-keyword=Nariwa Group kn-keyword=Nariwa Group en-keyword=Upper Triassic kn-keyword=Upper Triassic en-keyword=Xenoxylon kn-keyword=Xenoxylon END start-ver=1.4 cd-journal=joma no-vol=19 cd-vols= no-issue=1 article-no= start-page=5 end-page=11 dt-received= dt-revised= dt-accepted= dt-pub-year=2012 dt-pub=20121226 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Folded structure of the Carboniferous Ko-yama Limestone Group, Akiyoshi Belt, SW JAPAN kn-title=秋吉帯高山石灰岩層群の褶曲構造 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The fold structure of the Akiyoshi Belt was analyzed in Kawakami-cho, Okayama Prefecture, where the Lower Carboniferous to Middle Permian Ko-yama Limestone Group (Yokoyama et al., 1979), Permian Yoshii Group (Sano et al., 1987) and Triassic Nariwa Group (Teraoka, 1959) are distributed. The Nariwa Group unconformably covers the Paleozoic successions (Otoh, 1985). The Lower Carboniferous to Middle Permian Ko-yama Limestone Group, dated by foraminifers and fusulinids (Yokoyama et al., 1979), is mainly composed of massive limestone with basic volcanics, acidic tuff and chert. The Paleozoic successions of the Akiyoshi Belt were folded during the Middle to Late Permian (Suzuki et al., 1990). Strata of the Ko-yama Limestone Group generally strike E-W and dip to the north. The Hoya section about 300 m thick is composed of limestone, basic tuff, chert and acidic tuff, limestone, basic lava and tuff in ascending order. In this section, Ishida et al. (2012) recognized a nearly complete conodont faunal succession ranging from the upper Visean to the lower Moscovian. The faunal succession indicates younging southward, and the strata are overturned. A folded strucuture of tight overfold with north-dipping axial plane was reconstructed. Similar style of small scale overfolds of banded chert and turbidite were observed in the overlying Yoshii Group. en-copyright= kn-copyright= en-aut-name=InadaNoriyuki en-aut-sei=Inada en-aut-mei=Noriyuki kn-aut-name=稲田徳之 kn-aut-sei=稲田 kn-aut-mei=徳之 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= en-aut-name=IshidaKeisuke en-aut-sei=Ishida en-aut-mei=Keisuke kn-aut-name=石田啓祐 kn-aut-sei=石田 kn-aut-mei=啓祐 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学理学部地球科学科 affil-num=2 en-affil= kn-affil=岡山大学理学部地球科学科 affil-num=3 en-affil= kn-affil=徳島大学大学院ソシオ・アーツ・アンド・サイエンス研究部基礎科学部門自然科学分野 en-keyword=folded structure kn-keyword=folded structure en-keyword=Ko-yama Limestone Group kn-keyword=Ko-yama Limestone Group en-keyword=Carboniferous kn-keyword=Carboniferous en-keyword=Akiyoshi Belt kn-keyword=Akiyoshi Belt END start-ver=1.4 cd-journal=joma no-vol=19 cd-vols= no-issue=1 article-no= start-page=1 end-page=4 dt-received= dt-revised= dt-accepted= dt-pub-year=2012 dt-pub=20121226 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Holocene environmental and sea-level changes of the Okayama Plain ? evidence from peat beds ? kn-title=岡山平野の泥炭層から推測される完新世の海水準変動と古環境変遷 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Quaternary peat beds from bore-hole samples deliver information to reconstruct paleoenvironment. Altitudes of dated non-marine peat beds and marine beds allow to be created a sea-level curve. 4 peat beds (A to D) are identified from the uppermost Pleistocene to Holocene deposits of the Okayama Plain. They thought to be deposited at stable events during sea-level change. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学理学部地球科学科 en-keyword=Holocene kn-keyword=Holocene en-keyword=peat beds kn-keyword=peat beds en-keyword=paleoenvironment kn-keyword=paleoenvironment en-keyword=sea-level change kn-keyword=sea-level change en-keyword=Okayama Plain kn-keyword=Okayama Plain END start-ver=1.4 cd-journal=joma no-vol=18 cd-vols= no-issue=1 article-no= start-page=5 end-page=10 dt-received= dt-revised= dt-accepted= dt-pub-year=2011 dt-pub=20111226 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Newly proposed landform division in the Kibi Plateau area: Application for a hazard map of landslides kn-title=岡山市北部吉備高原地域における地形区分―斜面防災のための試み― en-subtitle= kn-subtitle= en-abstract= kn-abstract=The Kibi Plateau is characterized by horizontal skylines and they are considered to be an uplifted peneplain. Landform of the plateaus in central part of Okayama Prefecture is divided into "Kibi plateau landform" and "Recent dissecting landform". The Kibi plateau landform is composed of low relief surface and relict mountain. The altitude of the low relief surface varies from 300 to 450m in Kayo area, and 200 to 350m in Kanayama area. The Recent dissecting landform is characterized by escarpment and cuts the Kibi plateau landform. Knick-point is formed at the boundary between two landforms and steep slope is distributed just below the knick-point. The steep slope of the recent dissecting landform is unstable and a potential of landslide is high. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= en-aut-name=OmizoYuna en-aut-sei=Omizo en-aut-mei=Yuna kn-aut-name=大溝佑奈 kn-aut-sei=大溝 kn-aut-mei=佑奈 aut-affil-num=2 ORCID= en-aut-name=HirataMinoru en-aut-sei=Hirata en-aut-mei=Minoru kn-aut-name=平田稔 kn-aut-sei=平田 kn-aut-mei=稔 aut-affil-num=3 ORCID= en-aut-name=NishigakiMakoto en-aut-sei=Nishigaki en-aut-mei=Makoto kn-aut-name=西垣誠 kn-aut-sei=西垣 kn-aut-mei=誠 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学大学院自然科学研究科 affil-num=2 en-affil= kn-affil=岡山大学大学院自然科学研究科 affil-num=3 en-affil= kn-affil= affil-num=4 en-affil= kn-affil=岡山大学大学院環境学研究科 en-keyword=Kibi Plateau kn-keyword=Kibi Plateau en-keyword=landslide kn-keyword=landslide en-keyword=knick-point kn-keyword=knick-point en-keyword=Okayama Prefecture kn-keyword=Okayama Prefecture END start-ver=1.4 cd-journal=joma no-vol=16 cd-vols= no-issue=1 article-no= start-page=29 end-page=42 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=20091225 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=岡山県に分布する白亜紀前期羽山層砕屑物質の供給源:砕屑粒の鉱物化学組成とモード組成から導かれる制約 kn-title=Provenance of Early Cretaceous Hayama Formation, Okayama Prefecture, Inner Zone of Southwest Japan: constraints from modal mineralogy and mineral chemistry of derived detrital grains en-subtitle= kn-subtitle= en-abstract= kn-abstract=Petrographic and phase chemistry studies of detrital grains were carried out on sandstones from the Lower Cretaceous Hayama Formation, Inner Zone of Southwest Japan, to determine their provenance and the tectonic setting during the early Cretaceous. The results of the modal mineralogy suggest that the Hayama Formation has magmatic arc provenance and that deposition of the sediments took place in the back-arc areas with detritus mostly derived from the magmatic arc and rifted continental margins. The chemical compositions of chromian spinel, chlorite and sphene indicate that significant proportions of the detrital grains were derived from mafic and/or ultramafic sources. The source areas are the mafic and ophiolitic rocks in the Sangun-Renge and Akiyoshi terranes and the felsic volcanic rocks probably from either the Akiyoshi terrane or a source not presently exposed in southwest Japan. However, minor amounts of the detritus were derived from the basement rocks; i.e., carbonates and siliciclastic rocks of the Akiyoshi terrane and the metamorphosed mafic rocks of the Chizu terrane. en-copyright= kn-copyright= en-aut-name=AsieduDaniel K. en-aut-sei=Asiedu en-aut-mei=Daniel K. kn-aut-name=アシードダニエル kn-aut-sei=アシード kn-aut-mei=ダニエル aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= en-aut-name=ShibataTsugio en-aut-sei=Shibata en-aut-mei=Tsugio kn-aut-name=柴田次夫 kn-aut-sei=柴田 kn-aut-mei=次夫 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Science, University of Ghana affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 en-keyword=modal analysis kn-keyword=modal analysis en-keyword=sandstone kn-keyword=sandstone en-keyword=mineral chemistry kn-keyword=mineral chemistry en-keyword=provenance kn-keyword=provenance en-keyword=Hayama Formation kn-keyword=Hayama Formation END start-ver=1.4 cd-journal=joma no-vol=16 cd-vols= no-issue=1 article-no= start-page=1 end-page=7 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=20091225 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=The first Japanese word "chishitsu-gaku" for the "geology" was proposed by Genpo Mitsukuri (1799-1863) kn-title=日本最初の用語「地質学」の成立: 箕作阮甫(1799-1863)の貢献 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The first Japanese word "chishitsu-gaku" for the "geology" was proposed by Genpo Mitsukuri, a scientific contributor in the Tokugawa regime in the 19th century, who was born in 1799 in Tsuyama in Western Honshu, Japan and had worked for scientific activities of the Tokugawa government from 1839 to 1863. His major works for the first making of the "chishitsu-gaku" for the "geology" have been presented in this paper, also showing his contribution to Japanese sciences. en-copyright= kn-copyright= en-aut-name=OkadaHakuyu en-aut-sei=Okada en-aut-mei=Hakuyu kn-aut-name=岡田博有 kn-aut-sei=岡田 kn-aut-mei=博有 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil= affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=Genpo Mitsukuri kn-keyword=Genpo Mitsukuri en-keyword="chishitsu-gaku" kn-keyword="chishitsu-gaku" en-keyword=19th century kn-keyword=19th century END start-ver=1.4 cd-journal=joma no-vol=15 cd-vols= no-issue=1 article-no= start-page=9 end-page=32 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=20090331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Microscopic observations of the recent soils: a step for understanding the paleosols kn-title=現世土壌の岩石学的記載 : 古土壌研究への応用の一例 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The microscopic observations of the recent soil horizons were conducted in Okayama, Japan (moderate climate). The several soil horizons, including two surface (epipedon) and three subsurface horizons, were recognized in the forest, poorly vegetated hill, and riverside around the Okayama University. The umbric epipedon can be segregated from the organic-rich subsurface horizons by the scattered organic materials in thin sections. The ochrich epipedon shows the sandy matrix without any cements and the illuviation of clay minerals. The subsurface horizons identified in the study area are as follows: albic, argillic, and cambic horizons. Each subsurface horizon shows the specific structures in thin sections. The albic horizon is characterized by the absence of the illuviation. The argillic horizon definitely shows the clayey matrix and the illuviation of clay minerals. The primary structures may be retained in the cambic horizon. The microscopic examination of the Miocene paleosols from the Ukan-cho, Okayama, was attempted. By comparing the recent soils, the cambic horizon and spodic horizon, which is characterized by the concentration of sesquioxides, are identified in the paleosols. This attempt suggests that the microscopic observations of the recent soils is a useful guide to understanding the paleosols en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=福地亮 kn-aut-sei=福地 kn-aut-mei=亮 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=阪神コンサルタンツ affil-num=2 en-affil= kn-affil=岡山大学 en-keyword=soil kn-keyword=soil en-keyword=paleosol kn-keyword=paleosol en-keyword=soil horizon kn-keyword=soil horizon en-keyword=soil structure kn-keyword=soil structure en-keyword=microscopic observation kn-keyword=microscopic observation END start-ver=1.4 cd-journal=joma no-vol=15 cd-vols= no-issue=1 article-no= start-page=1 end-page=8 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=20090331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Permian and Triassic molluscan fossils from the Maizuru Zone,Okayama City, Southwest Japan kn-title=岡山市北部の舞鶴帯から産出した二枚貝・巻貝化石 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Permian and Triassic molluscan fossils are found from Mitsu-area, Okayama City, Southwest Japan. Permian bivalve and gastropod fossils are collected from mudstones of the Upper Formation of the Maizuru Group. 4 species of bivalves (Nuculopsis? sp. ind., Leptodesma sp. ind., Streblopteria cf. eichwaldi, Posidonia sp. ind.) and 5 species of gastropods (Worthenia cf. corrugata, Callitomaria n. sp. cf. stanislavi, Apachella n. sp. ind., ??Eunemopsis like trochid, ??Yunnania sp.) are identified. Lower Triassic bivalve fossils are collected from sandstones of the Oono Formation. Neoschizodus cf. laevigatus and Bakevellia (Maizuria) kambei are identified. en-copyright= kn-copyright= en-aut-name=NakazawaKeiji en-aut-sei=Nakazawa en-aut-mei=Keiji kn-aut-name=中澤圭二 kn-aut-sei=中澤 kn-aut-mei=圭二 aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=Roger LymanBatten kn-aut-sei=Roger Lyman kn-aut-mei=Batten aut-affil-num=2 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= en-aut-name=UwadaHideto en-aut-sei=Uwada en-aut-mei=Hideto kn-aut-name=宇和田英人 kn-aut-sei=宇和田 kn-aut-mei=英人 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=京都大学名誉教授 affil-num=2 en-affil= kn-affil=元アメリカ自然史博物館 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=インターナショナルペイント株式会社 en-keyword=Permian kn-keyword=Permian en-keyword=Triassic kn-keyword=Triassic en-keyword=bivalve and gastropod fossils kn-keyword=bivalve and gastropod fossils en-keyword=the Maizuru Zone kn-keyword=the Maizuru Zone en-keyword=Mitsu area kn-keyword=Mitsu area END start-ver=1.4 cd-journal=joma no-vol=1 cd-vols= no-issue=1 article-no= start-page=9 end-page=18 dt-received= dt-revised= dt-accepted= dt-pub-year=1994 dt-pub=19940920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Gradational development of slaty cleavage to schistosity -an example from the Iberian Pyrite Belt, Spain- en-subtitle= kn-subtitle= en-abstract= kn-abstract=The Iberian Pyrite Belt is an Upper Paleozoic succession which has been divided into the Phyllite-Quartzite Group, the Volcanic-Sliceous Complex and the Culm Group in ascending order from base to the top. The contacts among them are conformable. These Groups are tightly folded and metamorphosed un-der low-grade conditions during Hercynian times. The first stage folds of the Volcanic-Siliceous Complex and the Culm Group are associate with slaty cleavages (S1), while the Phyllite-Quartzite Group is asso-ciate with schistosities (S1). Fold analysis using cleavages and minoe folds has been utilized in the analysis of the stratigraphy. This led to systematic horizontal collection of specimens (pelitic rocks). S1 texture is defined by paralled alignment of secondary platy minerals which tend to grow larger and together, forming zonal domains toward the Phyllite-Quartzite Group. The clay matrices change to recrystallized quartz toward the Phyllite Quartzite Group. Textural modifications are evidenced by gradational changes from slaty cleavages to schistosities. This shows that recrystallization is the important deformation mecha-nism responsible for S1 development. It also reflects that the deformation was contemporaneous with metamorphism. en-copyright= kn-copyright= en-aut-name=Suzukishigeyuki en-aut-sei=Suzuki en-aut-mei=shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Sicences, Faculty of Science Okayama University en-keyword=Slaty cleavage kn-keyword=Slaty cleavage en-keyword=Schistosity kn-keyword=Schistosity en-keyword=Recrystallization kn-keyword=Recrystallization END start-ver=1.4 cd-journal=joma no-vol=2 cd-vols= no-issue=1 article-no= start-page=13 end-page=22 dt-received= dt-revised= dt-accepted= dt-pub-year=1995 dt-pub=19950920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Application of the remotely operated TV vehicle to make geological maps of the Seto Inland Sea kn-title=水中テレビロボットによる瀬戸内海での海底地質調査 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Submarine geological survey using the remotely operated TV vehicle (RV100), was carried out in 4 offshores of the Seto Inland Sea in Kagawa Prefecture. The study areas are west of Kosei Island of Sakaide City, south of Okado-bana of Nankai Town, west of Misaki of Takuma Town and north of Nou-Misaki of Sakaide City. TV vehicle transmite clear pictures of bottom of the sea to the monitor on board. The submarine geology of the study areas are composed of Cretaceous granitic basements and Quaternary sedimentary covers. By using these pictures Recent and Pleistocene deposits could be distinguished and lithology of sediments could also be identified. Lithology of sediments was however difficult to identify using the usual sonic prospecting method. Furthermore, pictures suggesting that ripples are just forming have been obtained. The TV vehicle is convenient in submarine survry, because it can travel much longeer and deeper than human diver. A new method of mapping submarine geology using TV vehicle was developed. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= en-aut-name=InadaTakashi en-aut-sei=Inada en-aut-mei=Takashi kn-aut-name=稲田孝司 kn-aut-sei=稲田 kn-aut-mei=孝司 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学理学部地球科学科 affil-num=2 en-affil= kn-affil=岡山大学文学部史学科 en-keyword=Submarine geology kn-keyword=Submarine geology en-keyword=the Seto Inland Sea kn-keyword=the Seto Inland Sea en-keyword=remotely operated TV vehicle kn-keyword=remotely operated TV vehicle END start-ver=1.4 cd-journal=joma no-vol=3 cd-vols= no-issue=1 article-no= start-page=17 end-page=24 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19960920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Paleogene talus deposits, Okayama City, Southwest Japan en-subtitle= kn-subtitle= en-abstract= kn-abstract=In eastern Chugoku area, Paleogene deposits have not been recognized until fission-track dating of so called "Mountain Gravels" was carried out (Suzuki et al. 1995). Two sedimentation events in Paleogene time (27Ma and 34-35Ma) are inferred by the F-T dating Major lithology of the Paleogene deposits in the study area is graved which is mainly composed of subrounded to rounded cobbles. The "Mountain Gravels" were previously thought to be lower Quaternary deposits. The "Mountain Gravels" is associsted with coal bearing mud, sand, gravel and breccia deposits. The breccia deposits is distributed sporadically between the "Mountain Gravels" and basement rocks. The deposits are mainly composed of poorly sorted breccia and associated granitic sands. It is inferred that the breccia deposits are talus deposits. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University en-keyword=Paleogene kn-keyword=Paleogene en-keyword=breccia kn-keyword=breccia en-keyword=talus deposits kn-keyword=talus deposits en-keyword=fission-track dating kn-keyword=fission-track dating END start-ver=1.4 cd-journal=joma no-vol=3 cd-vols= no-issue=1 article-no= start-page=1 end-page=16 dt-received= dt-revised= dt-accepted= dt-pub-year=1996 dt-pub=19960920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Provenance of Lower Cretaceous sediments in the Nariwa and Hokubo areas, Okayama Prefecture, deduced from detrital modes and geochemistry of sandstones en-subtitle= kn-subtitle= en-abstract= kn-abstract=Petrographic and geochemical study of sandstones from the Kenseki Formation have shown that the sandstones are compositionally immature. The immaturity is reflected geochemically by their low SiO2 contents (52-66 wt%) and petrographically by low modal percents of quartz and K-feldspar, and high modal percents of plagioclase and volcanic lithic fragmants. The Kensaki sandstones are, however, poor in Na2O (up to 2.1 wt%). Both petrography and geochemistry suggest a heterogeneous source lithologies of acidic and basic volcanics, sedimentary, and ultramafic rocks. Petrographic evidence is supplied by quartz and plagioclase of volcanic origin, acidic volcanic fragments, basic volcanic fragments, volcanic glass, serpentinite fragments and detrital spinel grains. Geochemical evidence is provided by high FeO* (total iron as FeO), MgO, TiO2, CaO and K2O contents. Petrographic and geochemical study of the Kenseki sandstones indicate calc-alkaline oceanic island are provenance. The sediments were locally derived, with Alpine-type ultramafic rocks exposed in the north and volcanic materials of the Akiyoshi Belt supplying the bulk of the detritus. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=Daniel K.Asiedu kn-aut-sei=Daniel K. kn-aut-mei=Asiedu aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= en-aut-name=ShibataTsugio en-aut-sei=Shibata en-aut-mei=Tsugio kn-aut-name=柴田次夫 kn-aut-sei=柴田 kn-aut-mei=次夫 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University affil-num=2 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University affil-num=3 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University en-keyword=Kenseki Formation kn-keyword=Kenseki Formation en-keyword=modal analyses kn-keyword=modal analyses en-keyword=provenance kn-keyword=provenance END start-ver=1.4 cd-journal=joma no-vol=4 cd-vols= no-issue=1 article-no= start-page=21 end-page=32 dt-received= dt-revised= dt-accepted= dt-pub-year=1997 dt-pub=19970920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Landslide occurrence and geology of the Triassic Nariwa Group, Southwest Japan kn-title=三畳系成羽層群の地質と地すべり en-subtitle= kn-subtitle= en-abstract= kn-abstract=Geological and topographical study of landslides in the Triassic Nariwa Group has been carried out. Nariwa Group is mostly composed of non-marine deposites and is characterized by cycle of fining upward successions. Landslides abundantly occur in the non-marine successions. Slip surface occure in coaly mudstones that have conspicuously less strength than sandstones. Creeps immediately below slip surfaces contribute to the occurrence of landslides in the Nariwa Group. en-copyright= kn-copyright= en-aut-name=HotaniShu en-aut-sei=Hotani en-aut-mei=Shu kn-aut-name=宝谷周 kn-aut-sei=宝谷 kn-aut-mei=周 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= en-aut-name=TanakaHajime en-aut-sei=Tanaka en-aut-mei=Hajime kn-aut-name=田中元 kn-aut-sei=田中 kn-aut-mei=元 aut-affil-num=3 ORCID= en-aut-name=YamadaTakuya en-aut-sei=Yamada en-aut-mei=Takuya kn-aut-name=山田琢哉 kn-aut-sei=山田 kn-aut-mei=琢哉 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学大学院理学研究科 affil-num=2 en-affil= kn-affil=岡山大学理学部地球科学科 affil-num=3 en-affil= kn-affil=複建調査設計梶@岡山支社 affil-num=4 en-affil= kn-affil=複建調査設計梶@岡山支社 en-keyword=Iandslide kn-keyword=Iandslide en-keyword=Nariwa Group kn-keyword=Nariwa Group en-keyword=coaly mudstone kn-keyword=coaly mudstone END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=1 article-no= start-page=13 end-page=16 dt-received= dt-revised= dt-accepted= dt-pub-year=1998 dt-pub=19980920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=(14)C ages of Quaternary deposits in Kojima Lake area, Tamano City, Okayama Prefecture kn-title=児島湾干拓地におけるボーリング試料から得られた(14)C年代測定値 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Two 14C ages are obtained from drilled core samples in Kojima Lake area. One is 7920±250 y.B.P. from peat which is just below silty clay of bay sediments (-14.30-14.61 m) The other is 24900+3450,-2450 y.B.P. from pale milky gray clay of fluvial sediments (-24.15-24.45 m). en-copyright= kn-copyright= en-aut-name=SasakiHajime en-aut-sei=Sasaki en-aut-mei=Hajime kn-aut-name=佐々木甫 kn-aut-sei=佐々木 kn-aut-mei=甫 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=鞄血噬Wオテック 北関東支店 affil-num=2 en-affil= kn-affil=岡山大学理学部地球科学科 en-keyword=(14)C age kn-keyword=(14)C age en-keyword=Quaternary kn-keyword=Quaternary en-keyword=Kojima Lake area kn-keyword=Kojima Lake area END start-ver=1.4 cd-journal=joma no-vol=5 cd-vols= no-issue=1 article-no= start-page=1 end-page=12 dt-received= dt-revised= dt-accepted= dt-pub-year=1998 dt-pub=19980920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Topography and deposits of terrace of Yokohama Town, Northeast Japan kn-title=横浜町に発達する段丘に地形と堆積物 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Higher, middle and Lower Terraces (Quaternary) have been distinguished in Yokohama Town, Aomori Prefecture. The Higher Terraces are subdivided into three terraces, H1,H2 and H3. They are distributed in hills. H1 and H2 deposites are composed of gravels of fan deposits. H3 deposits are composed of gravels, sands and mud of alluvial plain deposits. The Middle Terraces are subdivided into three terraces, M1, M1' and M2, and occupy almost all terraces in Yokohama Town. These deposits are composed of beach (sand with gravel) and fan (gravel) deposits. The Lower Terraces are subdivided into two terraces, L1 and L2. The L1 Terrace is distributed in limited area along coast and thought to be composed of beach deposits. The L2 Terrace is distributed in limited area along river and composed of braided stream deposits. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= en-aut-name=MiyawakiAkiko en-aut-sei=Miyawaki en-aut-mei=Akiko kn-aut-name=宮脇明子 kn-aut-sei=宮脇 kn-aut-mei=明子 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学理学部地球科学科 affil-num=2 en-affil= kn-affil= en-keyword=terrace kn-keyword=terrace en-keyword=beach deposits kn-keyword=beach deposits en-keyword=fan deposits kn-keyword=fan deposits en-keyword=Quaternary kn-keyword=Quaternary END start-ver=1.4 cd-journal=joma no-vol=6 cd-vols= no-issue=1 article-no= start-page=23 end-page=28 dt-received= dt-revised= dt-accepted= dt-pub-year=1999 dt-pub=19990920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Peat bed of Jomon age in Desaki Beach, Tamano City, Okayama Prefecture kn-title=玉野市出崎海岸に露出した縄文時代の泥炭層 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Peat bed remains isolated in the shoreline of western beach of Desaki peninsula. Collected samples gave radiocarbon data of 5790±80 and 5810±60 years BP. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= en-aut-name=YukimotoKoichi en-aut-sei=Yukimoto en-aut-mei=Koichi kn-aut-name=行基幸一 kn-aut-sei=行基 kn-aut-mei=幸一 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=岡山大学理学部地球科学科 affil-num=2 en-affil= kn-affil=大建工業株式会社 en-keyword=Peat kn-keyword=Peat en-keyword=Holocene kn-keyword=Holocene en-keyword=Desaki Beach kn-keyword=Desaki Beach END start-ver=1.4 cd-journal=joma no-vol=7 cd-vols= no-issue=1 article-no= start-page=47 end-page=50 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A New Species of Lithostrotion (Siphonodendron)(Rugosa) from the Hina Limestone, Okayama Prefecture, Southwest Japan en-subtitle= kn-subtitle= en-abstract= kn-abstract=A new rugose coral species, Lithostrotion (Siphonodendron) hinensis is described in this paper. It was collected from the Carboniferous Hina limestone in Okayama Prefecture, Southwest Japan. Judging from the paleontological data, the age indicates probably Late Viaean, Early Carboniferous. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=YamagiwaNobuo kn-aut-sei=Yamagiwa kn-aut-mei=Nobuo aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=OkimuraYuji kn-aut-sei=Okimura kn-aut-mei=Yuji aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Emeritus Prof. of Osaka Kyoiku University affil-num=2 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University affil-num=3 en-affil= kn-affil=Emeritus Prof. of Hiroshima University en-keyword=Early Carboniferous kn-keyword=Early Carboniferous en-keyword=rugosa kn-keyword=rugosa en-keyword=Lithostrotion (Siphonodendron) kn-keyword=Lithostrotion (Siphonodendron) en-keyword=Hina Limestone kn-keyword=Hina Limestone en-keyword=Okayama kn-keyword=Okayama END start-ver=1.4 cd-journal=joma no-vol=7 cd-vols= no-issue=1 article-no= start-page=41 end-page=46 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Tidal notch cut into the Namigata Limestone, 240m above sea level, Ibara City, Okayama Prefecture kn-title=岡山県井原市浪形の標高240mの石灰岩に残された海食地形 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The tidal notch and the sea caves which cut into the Namigata Limestone is stiuated in 240m above sea level, Ibara City. The notch assocciates the Namigata Terrace 200m to 240m high. These geomorphological features indicate an event of high sea level. However the age of the event has not been known. en-copyright= kn-copyright= en-aut-name=FujiwaraTakao en-aut-sei=Fujiwara en-aut-mei=Takao kn-aut-name=藤原貴生 kn-aut-sei=藤原 kn-aut-mei=貴生 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= en-aut-name=MaedaYasuo en-aut-sei=Maeda en-aut-mei=Yasuo kn-aut-name=前田保夫 kn-aut-sei=前田 kn-aut-mei=保夫 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Ryuten Astro Park affil-num=2 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University affil-num=3 en-affil= kn-affil=Institute of Natural and Environmental Sciences, Himeji Institute of Technology en-keyword=notch kn-keyword=notch en-keyword=sea cave kn-keyword=sea cave en-keyword=Namigata kn-keyword=Namigata en-keyword=Okayama Prefecture kn-keyword=Okayama Prefecture END start-ver=1.4 cd-journal=joma no-vol=7 cd-vols= no-issue=1 article-no= start-page=35 end-page=40 dt-received= dt-revised= dt-accepted= dt-pub-year=2000 dt-pub=20000920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Relashonships between "Mountation Gravels" and the Bizen and Tomihara Coal Measures, northern Okayama City, Southwest Japan kn-title=岡山市北部, 備前, 富原炭鉱の夾炭層と「山砂利層」との関係 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The Bizen and Tomihara Coalfields which were situated in northern Okayama City, had produced lignite during 1940s. Distribution of coal measures indicates that the coal measures are intercalated in the middle of the so-called "Mountain Gravels". The "Mountain Gravels" is subdivided into two formations ; the older, about 34〜35Ma, and the younger, about 27Ma, of fission track ages. The older formation inculudes the Bizen Coal Measures. On the other hand, the Tomihara Coal Measures are intercalated in the younger formation. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= en-aut-name=NakazawaKeiji en-aut-sei=Nakazawa en-aut-mei=Keiji kn-aut-name=中澤圭二 kn-aut-sei=中澤 kn-aut-mei=圭二 aut-affil-num=2 ORCID= en-aut-name=TanakaHajime en-aut-sei=Tanaka en-aut-mei=Hajime kn-aut-name=田中元 kn-aut-sei=田中 kn-aut-mei=元 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University affil-num=2 en-affil= kn-affil=Emeritus Prof. of Kyoto University affil-num=3 en-affil= kn-affil=Fukken Co. en-keyword=Bizen Coal Measures kn-keyword=Bizen Coal Measures en-keyword=Tomihara Coal Measures kn-keyword=Tomihara Coal Measures en-keyword=Okayama City kn-keyword=Okayama City en-keyword=Paleogene kn-keyword=Paleogene END start-ver=1.4 cd-journal=joma no-vol=8 cd-vols= no-issue=1 article-no= start-page=13 end-page=28 dt-received= dt-revised= dt-accepted= dt-pub-year=2001 dt-pub=20010920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Trace of the Median Tectonic Line in Mima area, eastern Shikoku kn-title=四国東部, 美馬町地域の中央構造線 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Tracing outcrops of shear zone were used to describe the geometry and structure of the Median Tectonic Line in Mima area, eastrn Shikoku. A distinct new fault outcrop was discovered between the Mino and Ikuchi Faults at the northern slope of the Mt. Boso. These two faults are regarded as a single continuous fault. The analysis of surface fabrics of quartz in fault in fault gauge has been carried out to determine relative fault activity events. en-copyright= kn-copyright= en-aut-name=MizuiYoshinobu en-aut-sei=Mizui en-aut-mei=Yoshinobu kn-aut-name=水井良暢 kn-aut-sei=水井 kn-aut-mei=良暢 aut-affil-num=1 ORCID= en-aut-name=TachibanaToru en-aut-sei=Tachibana en-aut-mei=Toru kn-aut-name=橘徹 kn-aut-sei=橘 kn-aut-mei=徹 aut-affil-num=2 ORCID= en-aut-name=Suzukishigeyuki en-aut-sei=Suzuki en-aut-mei=shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Nikken gijutu-sha Corp. affil-num=2 en-affil= kn-affil=Reserach Org. for Environmental Geology of Setouchi, c/o Suzuki Office, Graduate School of Natural Science, and Technology, Okayama University affil-num=3 en-affil= kn-affil=Department of Earth Sciences, Faculity of Science, Okayama University en-keyword=surface fabrics kn-keyword=surface fabrics en-keyword=fault gauge kn-keyword=fault gauge en-keyword=Mino-Ikuchi Fault kn-keyword=Mino-Ikuchi Fault en-keyword=Median Tectonic Line kn-keyword=Median Tectonic Line END start-ver=1.4 cd-journal=joma no-vol=8 cd-vols= no-issue=1 article-no= start-page=1 end-page=12 dt-received= dt-revised= dt-accepted= dt-pub-year=2001 dt-pub=20010920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Miocene Ukan Formation, Ukan Area, Okayama Prefecture, Southwest Japan kn-title=有漢町に分布する中新統有漢累層 en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this paper, we deal with the Miocene Ukan Formation, sporadically distributed in Ukan-cho, Okayama prefecture, from a viewpoint of analysis of lithology and molluscan assemblages. The Ukan Formation is lithostratigraphically divided into the Suzuoka Conglomerate, Yamagata Muddy Sandstone, Shimoyokomi Sandstone and Conglomerate, Azechi Sandstone and Conglomerate, Tsuneyama Siltstone Members in ascending order. The following 6 molluscan assemblages are recognized. The lower four members and the last member is correlative to the Lower Sandstone and Upper Shale Formation of the Bihoku Group, respectively judging from lithology and fauna. The temporal chages of the above mentioned molluscan assemblages represents that gradual deeping of sea during the depositional period from the Suzuoka Conglomerate and Yamagata Muddy Sandstone Members to the Azechi Sandstone and Conglomerate Member via the Shimoyokomi Sandstone and Conglomerate Member, and abrupt deeping of sea seems to have happened between the Azechi Sandstone and Conglomerate Member and the Tsuneyame Siltstone Member. en-copyright= kn-copyright= en-aut-name=FujiwaraTakao en-aut-sei=Fujiwara en-aut-mei=Takao kn-aut-name=藤原貴生 kn-aut-sei=藤原 kn-aut-mei=貴生 aut-affil-num=1 ORCID= en-aut-name=TaguchiEiji en-aut-sei=Taguchi en-aut-mei=Eiji kn-aut-name=田口栄次 kn-aut-sei=田口 kn-aut-mei=栄次 aut-affil-num=2 ORCID= en-aut-name=Suzukishigeyuki en-aut-sei=Suzuki en-aut-mei=shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Ryutenn Astro Park affil-num=2 en-affil= kn-affil=Reserach org. for Environmental Geology of Setouchi, Okayama University affil-num=3 en-affil= kn-affil=Department of Earth Sciences, Faculity of Science, Okayama University en-keyword=Lithology kn-keyword=Lithology en-keyword=Molluscan assemblage kn-keyword=Molluscan assemblage en-keyword=Paleoenvironmental change kn-keyword=Paleoenvironmental change en-keyword=Ukan Miocene kn-keyword=Ukan Miocene END start-ver=1.4 cd-journal=joma no-vol=9 cd-vols= no-issue=1 article-no= start-page=25 end-page=30 dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20020920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=The slope map of the Kibi plateau kn-title=傾斜区分図と第三紀層の分布でみた吉備高原の地形発達史 en-subtitle= kn-subtitle= en-abstract= kn-abstract=A peneplain is evident in Takahashi area from slope map presented in this paper. The map shows that older gentle valleys exist in the Kibi Plateau. Miocene marine deposits are colored on the slope map. The Miocene marine deposits mostly distribute along the older valleys. The distribution of the Paleogene gravel river deposits is not cintrolled by topography. en-copyright= kn-copyright= en-aut-name=FujiwaraTakao en-aut-sei=Fujiwara en-aut-mei=Takao kn-aut-name=藤原貴生 kn-aut-sei=藤原 kn-aut-mei=貴生 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Ryuten Astro Park affil-num=2 en-affil= kn-affil=Department of Earth Sciences, Faculity of Science, Okayama University en-keyword=Kibi Plateau kn-keyword=Kibi Plateau en-keyword=slope map kn-keyword=slope map en-keyword=Miocene kn-keyword=Miocene END start-ver=1.4 cd-journal=joma no-vol=9 cd-vols= no-issue=1 article-no= start-page=19 end-page=24 dt-received= dt-revised= dt-accepted= dt-pub-year=2002 dt-pub=20020920 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Pyrite spots formed along slaty cleavage texture of pelitic rocks of the Tamba Belt, Ujitawara Town, Kyoto Prefecture, Southwest Japan. kn-title=京都府宇治田原町の丹波帯泥質岩のストレート劈開に沿って産出する黄鉄鉱スポットについて en-subtitle= kn-subtitle= en-abstract= kn-abstract=Pyrite spots were identified in pelitic rocks from the Ujitawara area, southernmost part of Tamba belt. XMA analysis shows that the spots are composed of pyrite. The spots occur along slaty cleavage plane and form spotted shape of diameter of about 5mm. en-copyright= kn-copyright= en-aut-name=MikamiTeiji en-aut-sei=Mikami en-aut-mei=Teiji kn-aut-name=三上禎次 kn-aut-sei=三上 kn-aut-mei=禎次 aut-affil-num=1 ORCID= en-aut-name=MusashinoMakoto en-aut-sei=Musashino en-aut-mei=Makoto kn-aut-name=武蔵野實 kn-aut-sei=武蔵 kn-aut-mei=野實 aut-affil-num=2 ORCID= en-aut-name=Suzukishigeyuki en-aut-sei=Suzuki en-aut-mei=shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Sciences, Graduate school of Natural Science and Technology, Okayama University affil-num=2 en-affil= kn-affil=Kyoto University of Education affil-num=3 en-affil= kn-affil=Department of Earth Sciences, Graduate school of Natural Science and Technology, Okayama University en-keyword=The Tamba Group kn-keyword=The Tamba Group en-keyword=Ujitawata kn-keyword=Ujitawata en-keyword=pelitic rocks kn-keyword=pelitic rocks en-keyword=pyrite spots kn-keyword=pyrite spots en-keyword=slaty cleavage kn-keyword=slaty cleavage END start-ver=1.4 cd-journal=joma no-vol=10 cd-vols= no-issue=1 article-no= start-page=23 end-page=31 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=20031220 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Depositional environments of the Katsuta Group, eastern Tsuyama Basin, Southwest Japan kn-title=津山盆地東部に分布する中新統勝田層群の堆積環境 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The Miocene Katauta Group of the Syohoku-cho area is subdivides into 6 members ; The Uetsuki Conglomerate Member, Nara Sandy Mudstone Member, Tai Gravelly Sandstone Member, Takatori Conglomerate Member, Ayabe Mudstone Member and Maruyama Mutstone Member from bottom to top. The unconformity between Miocene deposits and basement rocks in this area was traced to obtain geometry of the Miocene basin. Contour maps of the bases of the Miocene Yoshino Formation and Takakura Formation indicate paleo-topography. The obtained topography demonstrates a valley, which flowed to north-west, and a few islands and bays. It indicates that these Miocene successuions were deposited in the topography which resemble to the present Seto Inland. en-copyright= kn-copyright= en-aut-name=YamasakiRyo en-aut-sei=Yamasaki en-aut-mei=Ryo kn-aut-name=山崎良 kn-aut-sei=山崎 kn-aut-mei=良 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Kiso-jiban Consultants Co., Ltd. affil-num=2 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University en-keyword=Katsuta Group kn-keyword=Katsuta Group en-keyword=Tsuyama Basin kn-keyword=Tsuyama Basin en-keyword=Miocene kn-keyword=Miocene en-keyword=geometry of basin kn-keyword=geometry of basin en-keyword=paleoenvironmental chage kn-keyword=paleoenvironmental chage END start-ver=1.4 cd-journal=joma no-vol=10 cd-vols= no-issue=1 article-no= start-page=15 end-page=22 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=20031220 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Distributions and ages of the Paleogene deposits in the Kibi Plateau Area, and Paleogene paleogeography kn-title=吉備高原周辺の古第三系に関する最近の知見とその古地理学的意義 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The "Kibi Plateau" forms a unique geomorphic province with the gently-sloping and stable continental feature. Gravel deposites called the "Mountain Gravels", are distributed sporadically in the Kibi Plateau, and have been considered Pliocene deposits. However, recent fission-track ages of the tuff beds intercalated in the deposits have indicated that the ago of deposits are Paleogen in the age. So far, fission-track ages (using zircon) of 61 to 65, 55, 37, 34 to 35 and 27 Ma are obtained. Remaining the belt-like distributions of the Paleogene gravelly valley-full deposits suggest that the Kibe Plateau has been keeping as a stable block, and repeated periods of incision followed by sedimentation of valley-fill deposits are occurred in the area during Paleogene period. en-copyright= kn-copyright= en-aut-name=TanakaHajime en-aut-sei=Tanaka en-aut-mei=Hajime kn-aut-name=田中元 kn-aut-sei=田中 kn-aut-mei=元 aut-affil-num=1 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=2 ORCID= en-aut-name=HotaniShu en-aut-sei=Hotani en-aut-mei=Shu kn-aut-name=宝谷周 kn-aut-sei=宝谷 kn-aut-mei=周 aut-affil-num=3 ORCID= en-aut-name=YamamotoYasuo en-aut-sei=Yamamoto en-aut-mei=Yasuo kn-aut-name=山本裕雄 kn-aut-sei=山本 kn-aut-mei=裕雄 aut-affil-num=4 ORCID= en-aut-name=DanharaTohru en-aut-sei=Danhara en-aut-mei=Tohru kn-aut-name=壇原徹 kn-aut-sei=壇原 kn-aut-mei=徹 aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=Fukken Co., Ltd. affil-num=2 en-affil= kn-affil=Graduate School of Natural Science and Technology affil-num=3 en-affil= kn-affil=INA Co., Ltd. affil-num=4 en-affil= kn-affil=KANSO Co., Ltd. affil-num=5 en-affil= kn-affil=Kyoto Fission-Track Co., Ltd. en-keyword=Kibi Plateau kn-keyword=Kibi Plateau en-keyword=gravelly valley-fill deposites kn-keyword=gravelly valley-fill deposites en-keyword=fission-track ages kn-keyword=fission-track ages en-keyword=Paleogene palaeogeography kn-keyword=Paleogene palaeogeography END start-ver=1.4 cd-journal=joma no-vol=11 cd-vols= no-issue=1 article-no= start-page=39 end-page=47 dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20041231 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Paleoenvironmental Analyses of the Buried Peat Deposit during the mid-Holocene at the Desaki Coast in Tamano City, Okayama Prefecture, Weatern Japan kn-title=岡山県玉野市出崎海岸に埋没する完新世中期の泥炭層の古環境解析 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The buried peat deposit was foud in the sand beach on the Desaki coast (Tamano City, Okayama Prefecture), the northeastern coast of Seto Inland Sea. In this study, we performed sulfur and diatom analyses of the deposit. The results were used along with 14C dates and the eruption age (7300 cal BP) of Kikai-Akahoya tephra (K-Ab) to derive sedimentary environments of the deposit. K-Ah was detected just below the peat deposit. At the culmination of the Jomon transgression, the peat deposit had been formed in brackish environments of salt marsh for about 300 years. In order to reconstruct local paleovegetation, we analyzed pollen, wood and plant fossils in the deposit. The results show vegetational transition from a deciduous broadleaved forest mainly of Ouercus subgen. Lepidobalanus to Pinus forest. In spite of the Holocene thermal optimum, the vegetation dominated by Ouercus subgen. Cyclobanopsis was not recognized at the Desaki site, as has been shown in many other regions of regions of western Japan. Ouercus sect. Prinus was replaced by Ouercus sect. Aegilops as the dominant section of Ouercus subgen. Lepidobalanus, suggesting early establishment of traditional rural vegetation of 'Satoyama' in Japan. However, no evidence for human agency has been obtained from the mid-Holocene archaeological sites around the Desaki site. Thus it is more likely that this vegetational transition resulted from the succession caused by natural forces such as ecological disturbance and climatic and/or endemic situations rather than by cultural deforestation. en-copyright= kn-copyright= en-aut-name=MatsushitaMariko en-aut-sei=Matsushita en-aut-mei=Mariko kn-aut-name=松下まり子 kn-aut-sei=松下 kn-aut-mei=まり子 aut-affil-num=1 ORCID= en-aut-name=SatoHiroshi en-aut-sei=Sato en-aut-mei=Hiroshi kn-aut-name=佐藤裕司 kn-aut-sei=佐藤 kn-aut-mei=裕司 aut-affil-num=2 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= en-aut-name=YukumotoKoichi en-aut-sei=Yukumoto en-aut-mei=Koichi kn-aut-name=行基幸一 kn-aut-sei=行基 kn-aut-mei=幸一 aut-affil-num=4 ORCID= en-aut-name=MomoharaArata en-aut-sei=Momohara en-aut-mei=Arata kn-aut-name=百原新 kn-aut-sei=百原 kn-aut-mei=新 aut-affil-num=5 ORCID= en-aut-name=UedaYayoi en-aut-sei=Ueda en-aut-mei=Yayoi kn-aut-name=植田弥生 kn-aut-sei=植田 kn-aut-mei=弥生 aut-affil-num=6 ORCID= en-aut-name=KatohShigehiro en-aut-sei=Katoh en-aut-mei=Shigehiro kn-aut-name=加藤茂弘 kn-aut-sei=加藤 kn-aut-mei=茂弘 aut-affil-num=7 ORCID= en-aut-name=MaedaYasuo en-aut-sei=Maeda en-aut-mei=Yasuo kn-aut-name=前田保夫 kn-aut-sei=前田 kn-aut-mei=保夫 aut-affil-num=8 ORCID= affil-num=1 en-affil= kn-affil=Research Institute for Higher Education, Kobe University affil-num=2 en-affil= kn-affil=Institute of Natural and Environmental Sciences, University of Hyogo affil-num=3 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University affil-num=4 en-affil= kn-affil=Daiken Kogyo Co Ltd. affil-num=5 en-affil= kn-affil=Department of Environmental Science, Faculty of Horiculture, Chiba University affil-num=6 en-affil= kn-affil=Paleo Labo Co Ltd. affil-num=7 en-affil= kn-affil=Museum of Nature and Human Activities, Hyogo affil-num=8 en-affil= kn-affil=Institute of Natural and Environmental Sciences, University of Hyogo en-keyword=Desaki coast kn-keyword=Desaki coast en-keyword=diatom remains kn-keyword=diatom remains en-keyword=Jomon transgression kn-keyword=Jomon transgression en-keyword=Kikai-Akahoya tephra kn-keyword=Kikai-Akahoya tephra en-keyword=mid-Holocene kn-keyword=mid-Holocene en-keyword=Paleoenvironment kn-keyword=Paleoenvironment en-keyword=peat deposit kn-keyword=peat deposit en-keyword=plant fossils kn-keyword=plant fossils END start-ver=1.4 cd-journal=joma no-vol=11 cd-vols= no-issue=1 article-no= start-page=33 end-page=37 dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=20041231 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Relative sea-level changes of the Okayama Plain Area during the Holocene, Southwest Japan kn-title=岡山平野における最終氷期最盛期以降の海水準変動 en-subtitle= kn-subtitle= en-abstract= kn-abstract=Postglacial relative sea-level change of the Okayama Plain Area has been analyzed. Former sea-levels were recognized by using peat beds and marine organisms which are also available for 14C dating. Peat beds were rhought to be formed under a stable sea-level condition. 14C ages of the analyzed peat beds were seprated by 4 groups ; 30〜18 ka BP, 11〜8 ka BP, 6〜4 ka BP and 3〜2.5 ka BP, indicate 4 stable sea-level periods. 2 transgressive events (18〜11 ka BP and 8〜6 ka BP) and one regressive event (3.5?〜3 ka BP) were also inferred. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University en-keyword=sea-level change kn-keyword=sea-level change en-keyword=peat bed kn-keyword=peat bed en-keyword=Holocene kn-keyword=Holocene en-keyword=Okayama Plain kn-keyword=Okayama Plain END start-ver=1.4 cd-journal=joma no-vol=13 cd-vols= no-issue=1 article-no= start-page=15 end-page=18 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=20060331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Geology of Holocene deposits in Mizushima Area, Okayama Prefecture, Japan kn-title=倉敷市水島地域の沖積地盤地質 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The study srea, Mizushima is occupied by polder and reclaimed land. The ground of this area is composed of the Holocene deposits below the surface. The deposits are mostly 10 to 20m in thickness and composed of 2 units, the B Unit and C&D Unit. The B Unit is composed of muddy sand with 2 to 3m in thickness. This unit is thought to be deposited in the mouth of paleoriver. The C&D Unit is composed of marine mud and sand with 10 to 15m in thickness. This unit is especially soft and will expand ground oscillations during an earthquake. en-copyright= kn-copyright= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Sciences, Okayama University en-keyword=Holocene deposits kn-keyword=Holocene deposits en-keyword=Mizushima Area kn-keyword=Mizushima Area en-keyword=Ground oscillation kn-keyword=Ground oscillation END start-ver=1.4 cd-journal=joma no-vol=13 cd-vols= no-issue=1 article-no= start-page=1 end-page=13 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=20060331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=バングラディシュの更新世台地の地形と地質 kn-title=A Review on the Quaternary Characteristics of Pleistocene Tracts of Bangladesh en-subtitle= kn-subtitle= en-abstract= kn-abstract=With regards to the origin and evolution of the Pleistocene tracts (Lalmai, Madhupur and Barind tracts) of Bangladesh, two trends of thoughts are common. Most of the authors believed that the Madhupur, Barind and Lalmai tracts represent tectonically uplifted surface. Some researchers have different opinion and they believed that the Lalmai hills and the Madhupur locality represent tectonically uplifted blocks but the whole Barind tract and the major portion of the Madhuput tracts are not tectonically uplifted, rather these are originated by erossional-depositional processes. In order to solve the problems associated with origin and evolution of Pleistocene tracts of Bangladesh, further study is needed. Borehole data may be collected and fusion images can be prepared from aerial photographs and setellite images to detect netectonic imprins and geomorphological signatures of the areas. Elaborate laboratory analysis of sediment deposits, radiocarbon dating my indicate a new dimension about the origin and evolution of these tracts. en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=TowhidaRashid kn-aut-sei=Towhida kn-aut-mei=Rashid aut-affil-num=1 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=Md. hossainMonsur kn-aut-sei=Md. hossain kn-aut-mei=Monsur aut-affil-num=2 ORCID= en-aut-name=SuzukiShigeyuki en-aut-sei=Suzuki en-aut-mei=Shigeyuki kn-aut-name=鈴木茂之 kn-aut-sei=鈴木 kn-aut-mei=茂之 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Graduate School of Natural Science and Tehonology, Okayama University affil-num=2 en-affil= kn-affil=Department of Geology, University of Dhaka, Bangladesh affil-num=3 en-affil= kn-affil=Graduate School of Natural Science and Tehonology, Okayama University en-keyword=Bangladesh kn-keyword=Bangladesh en-keyword=Lalmai Hill kn-keyword=Lalmai Hill en-keyword=Barind Tract kn-keyword=Barind Tract en-keyword=Madhupur Tract kn-keyword=Madhupur Tract en-keyword=Neotectonices kn-keyword=Neotectonices en-keyword=Aerial photographs kn-keyword=Aerial photographs en-keyword=Satellite Image kn-keyword=Satellite Image en-keyword=Fusion Image kn-keyword=Fusion Image END