南非卡鲁盆地晚二叠世陆地脊椎动物的突然灭绝和逐渐灭绝。

Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa.

作者信息

Ward Peter D, Botha Jennifer, Buick Roger, De Kock Michiel O, Erwin Douglas H, Garrison Geoffrey H, Kirschvink Joseph L, Smith Roger

机构信息

Department of Biology, University of Washington, Seattle, WA 98195, USA.

出版信息

Science. 2005 Feb 4;307(5710):709-14. doi: 10.1126/science.1107068. Epub 2005 Jan 20.

DOI:10.1126/science.1107068

PMID:15661973

Abstract

The Karoo basin of South Africa exposes a succession of Upper Permian to Lower Triassic terrestrial strata containing abundant terrestrial vertebrate fossils. Paleomagnetic/magnetostratigraphic and carbon-isotope data allow sections to be correlated across the basin. With this stratigraphy, the vertebrate fossil data show a gradual extinction in the Upper Permian punctuated by an enhanced extinction pulse at the Permian-Triassic boundary interval, particularly among the dicynodont therapsids, coinciding with negative carbon-isotope anomalies.

摘要

南非的卡鲁盆地暴露了一系列上二叠统至下三叠统的陆相地层，其中含有丰富的陆生脊椎动物化石。古地磁/磁性地层学和碳同位素数据使得盆地内各剖面能够相互对比。根据这一地层学，脊椎动物化石数据显示，上二叠统存在逐渐灭绝的现象，在二叠纪-三叠纪边界间隔处有一个增强的灭绝脉冲，特别是在二齿兽类兽孔目中，这与负碳同位素异常现象同时发生。