Marine environment and fauna at Hot House Earth during the Early Triassic

• Project/Area Number: 22540481
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: National Museum of Nature and Science, Tokyo
• Principal Investigator: SHIGETA Yasunari 独立行政法人国立科学博物館, 地学研究部, 研究主幹 (30270408)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 古環境 / 絶滅 / 回復 / 三畳紀 / 海洋環境 / 貧酸素 / 三畳系 / ロシア極東 / 貧酸 / 生物多様性 / 生痕化石

Research Abstract

The stratigraphy and fossil assemblages of the Lower Triassic in South Primorye, Russia reveals that the habitable environment for marine organisms was not resided below the storm wave base because of the influence of marine anoxia extending offshore bottom. The foresight of the dissolving anoxia is recognized at earliest Spathian. Because ammonoids, crinoids and bivalves were diversified during the Spathian, this oceanic recovery would lead the restructuring of marine organisms.