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

Science
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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