Report

Fossil Plants and Global Warming at the Triassic-Jurassic Boundary

+ See all authors and affiliations

Science  27 Aug 1999:
Vol. 285, Issue 5432, pp. 1386-1390
DOI: 10.1126/science.285.5432.1386

You are currently viewing the abstract.

View Full Text

Abstract

The Triassic-Jurassic boundary marks a major faunal mass extinction, but records of accompanying environmental changes are limited. Paleobotanical evidence indicates a fourfold increase in atmospheric carbon dioxide concentration and suggests an associated 3° to 4°C “greenhouse” warming across the boundary. These environmental conditions are calculated to have raised leaf temperatures above a highly conserved lethal limit, perhaps contributing to the >95 percent species-level turnover of Triassic-Jurassic megaflora.

  • * To whom correspondence should be addressed. E-mail: J.McElwain{at}sheffield.ac.uk

View Full Text