Terminal Cretaceous Environmental Events
- 8 March 1985
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 227 (4691) , 1161-1167
- https://doi.org/10.1126/science.227.4691.1161
Abstract
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.Keywords
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