| End-cretaceous mass extinction event: argument for terrestrial causation. | |
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MedLine Citation:
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PMID: 17744360 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The end-Cretaceous mass extinctions were not a geologically instantaneous event and were selective in character. These features are incompatible with the original Alvarez hypothesis of their being caused by a single asteroid impact that produced a world-embracing dust cloud with devastating environmental consequences. By analysis of physical and chemical evidence from the stratigraphic record it is shown that a modified extraterrestrial model in which stepwise extinctions resulted from encounter with a comet shower is less plausible than one intrinsic to the earth, involving significant disturbance in the mantle. |
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Authors:
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A Hallam |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Science (New York, N.Y.) Volume: 238 ISSN: 0036-8075 ISO Abbreviation: Science Publication Date: 1987 Nov |
Date Detail:
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Created Date: 2010-06-08 Completed Date: 2010-07-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0404511 Medline TA: Science Country: United States |
Other Details:
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Languages: eng Pagination: 1237-42 Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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