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Science 27 August 1999:
Vol. 285. no. 5432, pp. 1386 - 1390
DOI: 10.1126/science.285.5432.1386
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Reports
Fossil Plants and Global Warming at the Triassic-Jurassic Boundary
J. C. McElwain,
*
D. J. Beerling,
F. I. Woodward
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.
Department of Animal and Plant Sciences, University of Sheffield,
Sheffield, S10 2TN, UK.
*
To whom correspondence should be addressed. E-mail:
J.McElwain{at}sheffield.ac.uk
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