An iridium abundance anomaly at the palynological Cretaceous-Tertiary boundary in northern New Mexico
Science
By: C. J. Orth, J. S. Gilmore, J.D. Knight, C. L. Pillmore, R.H. Tschudy, and J.E. Fassett
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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.
| 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 |