大火山噴火が最初の生物大絶滅の原因 未解明の原因が明らかに! (IMAGE) Tohoku University Caption 大量絶滅の原因 Credit 海保 邦夫 Usage Restrictions Credit: Kunio Kaiho License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.