Fossil wood diversity gradient and Far-East Asia palaeoclimatology during the Late Triassic – Cretaceous interval |
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| Authors: | Changhwan Oh Julien Legrand Kyungsik Kim Marc Philippe In SungPaik |
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| Institution: | 1. Geological Survey of Japan, AIST, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan;2. Graduate School of Science and Technology, Niigata University, 8050 Nino-cho, Ikarashi, Niigata 950-2181, Japan;3. Department of Earth & Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan;1. Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China;2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;3. Yuxi Museum, Yuxi 653100, China;1. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 812-8581, Japan;2. Department of Chemistry, Tokyo Metropolitan University, Tokyo 192-0397, Japan;3. Department of Earth and Environmental Sciences, Kumamoto University, Kumamoto 860-8555, Japan;1. School of Biological Sciences, The University of Queensland, Brisbane 4072, Australia;2. Royal Botanic Gardens Melbourne, National Herbarium of Victoria, Birdwood Avenue, Melbourne 3000, Australia;3. School of Geography, Planning and Environmental Management, The University of Queensland, Brisbane 4072, Australia |
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| Abstract: | Mesozoic fossil floras are distributed over eastern Asia (China, Mongolia, Siberia, Korea and Japan) according to a regular latitudinal pattern. Two floras are usually distinguished, a northern type and a southern type, the distribution of which oscillated during the Mesozoic. In Japan, this regular pattern is disrupted by a sharp inflexion of the boundary between the two floras. Two competing hypotheses have been proposed to explain this disruption. One hypothesis advocates later tectonic motion clouding the original pattern, while the other hypothesis proposes that a warm oceanic current allowed the southern flora to grow much further north in coastal areas. We used fossil wood, a biotic component that has not previously been used, for a palaeobiogeographical study of the region. The observed fossil wood diversity at the generic level does not fit with the hypothesis of a warm oceanic current, unless this hypothesis is modified to include alternating warm northbound and cold southbound oceanic currents. Our results provide new evidence for the palaeoecology of the Mesozoic continental biota in Far-East Asia. |
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