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Science 11 May 2001:
Vol. 292. no. 5519, pp. 1148 - 1151
DOI: 10.1126/science.1058574
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Reports
Sudden Productivity Collapse Associated with the Triassic-Jurassic Boundary Mass Extinction
P. D. Ward,1*
J. W. Haggart,2
E. S. Carter,3
D. Wilbur,4
H. W. Tipper,2
T. Evans1
The end-Triassic mass extinction is one of the five most
catastrophic in Phanerozoic Earth history. Here we report carbon isotope evidence of a pronounced productivity collapse at the boundary,
coincident with a sudden extinction among marine plankton, from
stratigraphic sections on the Queen Charlotte Islands, British Columbia, Canada. This signal is similar to (though smaller than) the
carbon isotope excursions associated with the Permian-Triassic and
Cretaceous-Tertiary events.
1 Department of Earth and Space Sciences,
University of Washington, Seattle, WA 98195, USA.
2 Geological Survey of Canada, Vancouver, British
Columbia V6B 5J3, Canada.
3 Department of Geology,
Portland State University, Portland, OR 97207, USA.
4 Department of Oceanography, University of
Washington, Seattle, WA 98195, USA.
*
To whom correspondence should be addressed.
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