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Molluscan extinction patterns across the Cenomanian-Turonian stage boundary in the western interior of the United States

Paleobiology

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Abstract

High-resolution stratigraphic analysis of 18 sections spanning the Cenomanian-Turonian Stage boundary in the western interior of the United States has allowed determination of the magnitude and pattern of molluscan extinction and disruption. Composite range data from all sections show that the faunal turnover across the stage boundary occurs in a series of narrow stratigraphic zones, defined by multiple first and last occurrences, separated by intervals displaying little or no taxonomic turnover. Two of the apparent extinction steps (bottom and top of the Neocardioceras juddii Zone) may be intercontinentally developed. The additional steps apparently reflect cyclic changes in water mass and substrate characteristics in the western interior basin produced in response to orbital forcing of climate. The most affected mollusks were those having intercontinental distributions. -Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Molluscan extinction patterns across the Cenomanian-Turonian stage boundary in the western interior of the United States
Series title:
Paleobiology
Volume
15
Issue:
3
Year Published:
1989
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Paleobiology
First page:
299
Last page:
320
Number of Pages:
22