TIME CALIBRATION OF TRIASSIC-JURASSIC MICROFLORAL TURNOVER, EASTERN NORTH-AMERICA

被引：82

作者：

FOWELL, SJ ^{[1
]}

OLSEN, PE ^{[1
]}

机构：

[1] COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964

来源：

TECTONOPHYSICS | 1993年 / 222卷 / 3-4期

关键词：

D O I：

10.1016/0040-1951(93)90359-R

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Palynological data from the Newark basin of the Newark Supergroup reveal a spike in the spore/pollen ratio at the Triassic/Jurassic boundary. This spore spike is coincident with a 60% regional extinction of the palynoflora and approximately synchronous with terrestrial vertebrate extinctions. Orbitally controlled sedimentary cycles allow stratigraphic sections to be calibrated in time, constraining the duration of the microfloral turnover to an interval of 21 ky. The geologically brief palynofloral break is similar to Cretaceous/Tertiary boundary fern spikes. These data support a Triassic/Jurassic boundary impact-extinction scenario.

引用

页码：361 / 369

页数：9

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