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Science 16 March 1984:
Vol. 223. no. 4641, pp. 1180 - 1183
DOI: 10.1126/science.223.4641.1180
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Articles

Geologic Framework of Nonmarine Cretaceous-Tertiary Boundary Sites, Raton Basin, New Mexico and Colorado

C. L. PILLMORE 1, R. H. TSCHUDY 1, C. J. ORTH 2, J. S. GILMORE 2, and J. D. KNIGHT 2

1 U.S. Geological Survey, Denver, Colorado 80225
2 Los Alamos National Laboratory, Los Alamos, New Mexico 87545

Iridium concentrations are anomalously high at the palynological Cretaceous-Tertiary boundary in fluvial sedimentary rocks of the lower part of the Raton Formation at several localities in the Raton Basin of New Mexico and Colorado. The iridium anomaly is associated with a thin bed of kaolinitic claystone in a discontinuous carbonaceous shale and coal sequence.

Submitted on July 14, 1983
Accepted on September 30, 1983


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