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An iridium abundance anomaly at the palynological Cretaceous-Tertiary boundary in northern New Mexico

Science

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, , , , , and

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Abstract

An iridium abundance anomaly, with concentrations up to 5000 parts per trillion over a background level of 4 to 20 parts per trillion, has been located in sedimentary rocks laid down under freshwater swamp conditions in the Raton Basin of northeastern New Mexico. The anomaly occurs at the base of a coal bed, at the same stratigraphic position at which several well-known species of Cretaceous-age pollen became extinct. Copyright ?? 1981 AAAS.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
An iridium abundance anomaly at the palynological Cretaceous-Tertiary boundary in northern New Mexico
Series title:
Science
Volume
214
Issue:
4527
Year Published:
1981
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1341
Last page:
1343