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― 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-
Erect fossil stumps were found from the outcrop of the Upper Triassic Hinabata Formation, the uppermost part ofthe Nariwa Group at Hinabata, Nariwa-cho,Takahashi City, Okayama Prefecture, SW Japan. They are evidence ofthe oldest fossil forest in Japan. The Upper Triassic Nariwa Group is mostly composed of non-marine depositsexcept the marine Jito Formation and characterized by the abundance in plant fossils. The marine Jito Formation ischaracterized by occurrence of Norian Monotis ochotica. On the basis of detailed observation of the occurrence oferect fossil stumps, as well as sedimentary facies of fossil-bearing unit, the fossil forest was interpreted to havegrown on the top of the natural-levee units. One of the erect fossil stumps was identified as Xenoxylon sp.
- Okayama University Earth Science Report
Okayama University Earth Science Report 19(1), 25-37, 2012-12-26