| 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 |
| Genre: | Article |
| ProdID: | 70015198 |
| Citation Author: | Elder, W. P. |
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| Citation End Page: | 320 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Paleobiology |
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| Citation Number Of Pages: | 22 |
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| Citation Search Results Text: | Molluscan extinction patterns across the Cenomanian-Turonian stage boundary in the western interior of the United States; 1989; Article; Journal; Paleobiology; Elder, W. P. |
| Citation Start Page: | 299 |
| Citation Volume: | 15 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Molluscan extinction patterns across the Cenomanian-Turonian stage boundary in the western interior of the United States; 1989; Article; Journal; Paleobiology; Elder, W. P. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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