Geologic framework of nonmarine Cretaceous-Tertiary boundary sites, Raton Basin, New Mexico and Colorado
Pillmore CL, Tschudy RH, Orth CJ, Gilmore JS, Knight JD. 1984. Geologic framework of nonmarine Cretaceous-Tertiary boundary sites, Raton Basin, New Mexico and Colorado. Science. 223(4641):1180-1183
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.
- Type
- Journal Article
- Authors
- Pillmore, C; Tschudy, R; Orth, C; Gilmore, J; Knight, J
- Units
- GRSA
- Keywords
- Abundance, anomalies, Biostratigraphy, Boundary, Clastic Rocks, claystone, Colfax County, Colorado, Correlation, Cretaceous, Fluvial Environment, Geochemistry, Geology, iridium, Las Animas County, lower tertiary, Microfossils, miospores, New Mexico, Paleocene, Paleoecology, Paleogene, Palynomorphs, Raton Basin, Raton Formation, Southwestern U.S., Stratigraphy, terrestrial environment, Tertiary, Trace Elements, Upper Cretaceous, Western U.S.