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Extinction pattern of Inoceramus (Bivalvia) based on shell fragment biostratigraphy

By
Kenneth G. MacLeod
Kenneth G. MacLeod
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Peter D. Ward
Peter D. Ward
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Published:
January 01, 1990

Inoceramus gradually declined in abundance over a narrow stratigraphie interval of the Maastrichtian Stage and apparently went extinct synchronously across a wide range of depths and facies near the Globotruncana ganserri/Abathomphalus mayaroensis planktonic foram zonal boundary, well before the K/T boundary. This conclusion is based largely on the observed numeric density of prismatic shell fragments of Inoceramus through eight stratigraphie sections. If care is taken to minimize the possibility of contamination through physical and biological reworking, prism density seems to follow Inoceramus density and could be a powerful new biostratigraphic tool.

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GSA Special Papers

Global Catastrophes in Earth History; An Interdisciplinary Conference on Impacts, Volcanism, and Mass Mortality

Virgil L. Sharpton
Virgil L. Sharpton
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Peter D. Ward
Peter D. Ward
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Geological Society of America
Volume
247
ISBN print:
9780813722474
Publication date:
January 01, 1990

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