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Late Cretaceous Nannoplankton and the Change at the Cretaceous-Tertiary Boundary

By
Hans R. Thierstein
Hans R. Thierstein
Scripps Institution of Oceanography, University of California
San Diego, La Jolla, California 92093 U.S.A.
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Published:
January 01, 1981

Abstract

Quantitative taxonomic analyses of Late Campanian to Early Danian calcareous nannofossil assemblages suggest worldwide stable ecological conditions in the photic zone during the last 15 million years of the Mesozoic. Late Cretaceous bioprovincialism was strongly paleolatitudinal. The sudden extinction of the Cretaceous assemblages was followed by low supply of phytoplankton carbonate and by blooms of neritic taxa in the Early Danian, indicating low productivity and ecological instability. The most complete Cretaceous-Tertiary boundary record studied is at DSDP Site 356 (South Atlantic), where thicknesses of zones close to the boundary are twice those at Gubbio, Italy. The mode of calcareous phytoplankton evolution appears unsuitable for tests of theoretical evolutionary models.

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SEPM Special Publication

The Deep Sea Drilling Project: A Decade of Progress

John E. Warme
John E. Warme
Colorado School of Mines, Golden Colorado.
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Robert G. Douglas
Robert G. Douglas
University of Southern California, Los Angeles California
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Edward L. Winterer
Edward L. Winterer
Scripps Institution of Oceanography, La Jolla California
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SEPM Society for Sedimentary Geology
Volume
32
ISBN electronic:
9781565761629
Publication date:
January 01, 1981

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