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Plant Fossils from the Arimine Formation (Oxfordian, Jurassic) of the Tetori Group in Arimine, Toyama Prefecture, Central Japan
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Abstract
Abstract.
Ptilophyllum sp. and Zamites brevipennis are newly described from the middle Oxfordian Arimine Formation in the Arimine area, Toyama Prefecture, Central Japan. These two species characterize the vegetation of the Eurosinian paleophytogeographic province where a climate with dry season(s) prevailed. This finding, as well as the presence of a Kaizara Flora, suggests that Eurosinian-type vegetations continuously flourished during the late Bathonian to Oxfordian on the land of the Tetori Group. We also infer that Tetori-type floras first appeared during the Tithonian in the Tetori Group.
Received 10 7月 2017
Accepted 25 8月 2017
Acknowledgments:
This study was partly supported by the Research Project of the National Museum of Nature and Science under the name “Historical Development and Origin of Biodiversity under Global Environmental Dynamics.” The Hokuriku Electric Power Company, Ministry of the Environment, and Toyama Prefecture kindly gave me permission to collect specimens in Chubu Sangaku National Park (Chubu Mountain National Park). I am grateful to T. Hayashi, K. Hachiya, and Y. Mizuno for their assistance in the collection of specimens.
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