Japan Geoscience Union Meeting 2016

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Oral

Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT06] Phanerozoic biodiversity change: Extinction and diversification

Thu. May 26, 2016 10:45 AM - 12:15 PM 301A (3F)

Convener:*Yukio Isozaki(Department of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo), Yusuke Sawaki(Tokyo Institute of Technology), Chair:Yusuke Sawaki(Tokyo Institute of Technology)

Biotic evolution was the consequence of repeated extinction and following diversification in the past, which was caused by large-scale environmental changes, in particular, by extremely rapid and drastic forcing that changed the environments of the biosphere. Irreversible and episodic changes in material cycling on the planet and/or in galactic cosmic radiation are nominated as major driving mechanism for the alleged rapid, large-scale environmental perturbations. The biodiversity change in the fossiliferous Phanerozoic record is characterized by multiple mass extinctions within the long-term trend of diversity increase. Nonetheless, each extinction event has been explained rather in ad hoc manner, without any universal explanation. This session discusses the Phanerozoic biodiversity change under a new light of the recent progress in geology.

10:45 AM - 11:00 AM

[BPT06-01] Do we have any evidence of the existence of bilaterian animals in the Ediacaran? New trace fossil data from the Ediacaran of western Mongolia

*Tatsuo Oji1, Stephen Dornbos2, Keigo Yada3, Hitoshi Hasegawa1, Sersmaa Gonchigdorj5,4, Takafumi Mochizuki5 (1.Nagoya University Museum, Nagoya University, 2.University of Wisconsin-Milwaukee, 3.Graduate School of Environmental Sciences, Nagoya University, 4.Mongolian University of Science and Technology, 5.Iwate Prefectural Museum)

11:30 AM - 11:45 AM

[BPT06-04] Oxygen and bioessential element-depleted surface waters with massive soil intrusion in the end-Permian mass extinction

*Kunio Kaiho1, Ryosuke Saito1, Kosuke Ito1, Miyaji Takashi1, Li Tian2, Hiroyoshi Sano3, Zhiqiang Shi4, Satoshi Takahashi6, Jinnan Tong2, Lei Liang2, Masahiro Oba1, Fumiko W. Nara5, Noriyoshi Tsuchiya5, Zhong-Qiang Chen2 (1.Graduate School of Science, Tohoku University, 2.China University of Geosciences, 3.Kyushu University, 4.Chengdu University of Technology, 5.Graduate School of Environmental Studies, Tohoku University, 6.University of Tokyo)