Correlation of the largest craters,stratigraphic impact signatures,and extinction events over the past 250 Myr  

作　　者：Michael R.Rampino Ken Caldeira 

机构地区：[1]Department of Biology,New York University,100 Washington Square East,New York,NY 10003,USA [2]NASA,Goddard Institute for Space Studies,2880 Broadway,New York,NY 10025,USA [3]Carnegie Institute for Science,Department of Global Ecology,260 Panama St.,Stanford,CA 94305,USA

出　　处：《Geoscience Frontiers》2017年第6期1241-1245,共5页地学前缘（英文版）

基　　金：Support for Rampino came from an NYU Research Challenge grant

摘　　要：The six largest known impact craters of the last 250 Myr(≥70 km in diameter),which are capable of causing significant environmental damage,coincide with four times of recognized extinction events at 36(with 2 craters),66,and 145 Myr ago,and possibly with two provisional extinction events at 168 and215 Myr ago.These impact cratering events are accompanied by layers in the geologic record interpreted as impact ejecta.Chance occurrences of impacts and extinctions can be rejected at confidence levels of99.96%(for 4 impact/extinctions)to 99.99%(for 6 impact/extinctions).These results argue that several extinction events over the last 250 Myr may be related to the effects of large-body impacts.The six largest known impact craters of the last 250 Myr(≥70 km in diameter),which are capable of causing significant environmental damage,coincide with four times of recognized extinction events at 36(with 2 craters),66,and 145 Myr ago,and possibly with two provisional extinction events at 168 and215 Myr ago.These impact cratering events are accompanied by layers in the geologic record interpreted as impact ejecta.Chance occurrences of impacts and extinctions can be rejected at confidence levels of99.96%(for 4 impact/extinctions)to 99.99%(for 6 impact/extinctions).These results argue that several extinction events over the last 250 Myr may be related to the effects of large-body impacts.

关 键 词：EXTINCTIONS IMPACT CRATERS EJECTA layers 

分 类 号：P53[天文地球—古生物学与地层学]