Terminal Cretaceous Environmental Events

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Science  08 Mar 1985:
Vol. 227, Issue 4691, pp. 1161-1167
DOI: 10.1126/science.227.4691.1161


The geologic record of terminal Cretaceous environmental events indicates that iridium and other associated elements were not deposited instantaneously but during a time interval spanning some 10,000 to 100,000 years. The available geologic evidence favors a mantle rather than meteoritic origin for these elements. These results are in accord with the scenario of a series of intense eruptive volcanic events occurring during a relatively short geologic time interval and not with the scenario of a single large asteroid impact event.

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