JaLCDOI 10.18926/ESR/15022
Title Alternative Permian and Triassic molluscan fossils from the Maizuru Zone,Okayama City, Southwest Japan
FullText URL 015_001_008.pdf
Author Nakazawa, Keiji| Roger Lyman Batten| Suzuki, Shigeyuki| Uwada, Hideto|
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.
Keywords Permian Triassic bivalve and gastropod fossils the Maizuru Zone Mitsu area
Publication Title Okayama University Earth Science Report
Published Date 2009-03-31
Volume volume15
Issue issue1
Start Page 1
End Page 8
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002307247
Author Suzuki, shigeyuki|
Published Date 1994-09-20
Publication Title Okayama University Earth Science Report
Volume volume1
Issue issue1
Content Type Departmental Bulletin Paper
Author Suzuki, Shigeyuki| Inada, Takashi|
Published Date 1995-09-20
Publication Title Okayama University Earth Science Report
Volume volume2
Issue issue1
Content Type Departmental Bulletin Paper
Author Suzuki, Shigeyuki|
Published Date 1996-09-20
Publication Title Okayama University Earth Science Report
Volume volume3
Issue issue1
Content Type Departmental Bulletin Paper
Author Daniel K. Asiedu| Suzuki, Shigeyuki| Shibata, Tsugio|
Published Date 1996-09-20
Publication Title Okayama University Earth Science Report
Volume volume3
Issue issue1
Content Type Departmental Bulletin Paper
Author Hotani, Shu| Suzuki, Shigeyuki| Tanaka, Hajime| Yamada, Takuya|
Published Date 1997-09-20
Publication Title Okayama University Earth Science Report
Volume volume4
Issue issue1
Content Type Departmental Bulletin Paper
Author Sasaki, Hajime| Suzuki, Shigeyuki|
Published Date 1998-09-20
Publication Title Okayama University Earth Science Report
Volume volume5
Issue issue1
Content Type Departmental Bulletin Paper
Author Suzuki, Shigeyuki| Miyawaki, Akiko|
Published Date 1998-09-20
Publication Title Okayama University Earth Science Report
Volume volume5
Issue issue1
Content Type Departmental Bulletin Paper
Author Suzuki, Shigeyuki| Yukimoto, Koichi|
Published Date 1999-09-20
Publication Title Okayama University Earth Science Report
Volume volume6
Issue issue1
Content Type Departmental Bulletin Paper
Author Yamagiwa Nobuo| Suzuki, Shigeyuki| Okimura Yuji|
Published Date 2000-09-20
Publication Title Okayama University Earth Science Report
Volume volume7
Issue issue1
Content Type Departmental Bulletin Paper
Author Fujiwara, Takao| Suzuki, Shigeyuki| Maeda, Yasuo|
Published Date 2000-09-20
Publication Title Okayama University Earth Science Report
Volume volume7
Issue issue1
Content Type Departmental Bulletin Paper
Author Suzuki, Shigeyuki| Nakazawa, Keiji| Tanaka, Hajime|
Published Date 2000-09-20
Publication Title Okayama University Earth Science Report
Volume volume7
Issue issue1
Content Type Departmental Bulletin Paper
Author Mizui, Yoshinobu| Tachibana, Toru| Suzuki, shigeyuki|
Published Date 2001-09-20
Publication Title Okayama University Earth Science Report
Volume volume8
Issue issue1
Content Type Departmental Bulletin Paper
Author Fujiwara, Takao| Taguchi, Eiji| Suzuki, shigeyuki|
Published Date 2001-09-20
Publication Title Okayama University Earth Science Report
Volume volume8
Issue issue1
Content Type Departmental Bulletin Paper
Author Fujiwara, Takao| Suzuki, Shigeyuki|
Published Date 2002-09-20
Publication Title Okayama University Earth Science Report
Volume volume9
Issue issue1
Content Type Departmental Bulletin Paper
Author Mikami, Teiji| Musashino, Makoto| Suzuki, shigeyuki|
Published Date 2002-09-20
Publication Title Okayama University Earth Science Report
Volume volume9
Issue issue1
Content Type Departmental Bulletin Paper
JaLCDOI 10.18926/ESR/13875
Title Alternative Depositional environments of the Katsuta Group, eastern Tsuyama Basin, Southwest Japan
FullText URL earth_science_reports_010_1_23.pdf
Author Yamasaki, Ryo| Suzuki, Shigeyuki|
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.
Keywords Katsuta Group Tsuyama Basin Miocene geometry of basin paleoenvironmental chage
Publication Title Okayama University Earth Science Report
Published Date 2003-12-20
Volume volume10
Issue issue1
Start Page 23
End Page 31
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310475
JaLCDOI 10.18926/ESR/13874
Title Alternative Distributions and ages of the Paleogene deposits in the Kibi Plateau Area, and Paleogene paleogeography
FullText URL earth_science_reports_010_1_15.pdf
Author Tanaka, Hajime| Suzuki, Shigeyuki| Hotani, Shu| Yamamoto, Yasuo| Danhara, Tohru|
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.
Keywords Kibi Plateau gravelly valley-fill deposites fission-track ages Paleogene palaeogeography
Publication Title Okayama University Earth Science Report
Published Date 2003-12-20
Volume volume10
Issue issue1
Start Page 15
End Page 22
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310517
JaLCDOI 10.18926/ESR/13870
Title Alternative Paleoenvironmental Analyses of the Buried Peat Deposit during the mid-Holocene at the Desaki Coast in Tamano City, Okayama Prefecture, Weatern Japan
FullText URL earth_science_reports_011_1_39.pdf
Author Matsushita, Mariko| Sato, Hiroshi| Suzuki, Shigeyuki| Yukumoto, Koichi| Momohara, Arata| Ueda, Yayoi| Katoh, Shigehiro| Maeda, Yasuo|
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.
Keywords Desaki coast diatom remains Jomon transgression Kikai-Akahoya tephra mid-Holocene Paleoenvironment peat deposit plant fossils
Publication Title Okayama University Earth Science Report
Published Date 2004-12-31
Volume volume11
Issue issue1
Start Page 39
End Page 47
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310603
JaLCDOI 10.18926/ESR/13869
Title Alternative Relative sea-level changes of the Okayama Plain Area during the Holocene, Southwest Japan
FullText URL earth_science_reports_011_1_33.pdf
Author Suzuki, Shigeyuki|
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.
Keywords sea-level change peat bed Holocene Okayama Plain
Publication Title Okayama University Earth Science Report
Published Date 2004-12-31
Volume volume11
Issue issue1
Start Page 33
End Page 37
ISSN 1340-7414
language 日本語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310268