岡山大学 地球科学研究報告
Published by Okayama University Earth Science Reports Editorial Committee

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-

Yukawa, Hirokazu
Terada, Kazuo
Sun, Ge
Published Date
2012-12-26
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.
Keywords
erect fossil stump
fossil forest
Nariwa Group
Upper Triassic
Xenoxylon
ISSN
1340-7414
NCID
AN10506284
NAID
JaLCDOI