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

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 cla...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1984-03, Vol.223 (4641), p.1180-1183
Main Authors: Pillmore, C. L., Tschudy, R. H., Orth, C. J., Gilmore, J. S., Knight, J. D.
Format: Article
Language:English
Subjects:
Canyons
Coal
Cretaceous
Cretaceous period
Ferns
Geological research
Geology, Stratigraphic
Iridium
Mudstone
Observations
Pollen
Rocks
Sandstones
Shales
Spores
Stratigraphy
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.223.4641.1180