Graneros Shale
The Graneros Shale is a geologic formation in the western United States, east of the Rocky Mountains.[1][2] It preserves fossils dating back to the Cretaceous period.[3]
| Graneros Shale Stratigraphic range: Cretaceous | |
|---|---|
| Type | Formation |
| Underlies | Greenhorn Formation |
| Overlies | Dakota Formation |
| Location | |
| Region | CO,IA,KS,MN,MT,NM,NE,ND,OK,SD,WY |
| Country |  |
| Type section | |
| Named for | Graneros Creek, Walsenburg quadrangle, Pueblo Colorado |
| Named by | Gilbert |
| Year defined | 1896 |
References
- Siliciclastic and calcareous sedimentary rocks of early Late Cretaceous age in the Western Interior of the United States have been assigned to, in ascending order, the Graneros Shale, Greenhorn Formation, Carlile Shale, Niobrara Formation, and their lateral equivalents (including members of the Frontier Formation and overlying formations). Merewether, E. Allen; Cobban, William A.; Obradovich, John D. (2007). "Regional disconformities in Turonian and Coniacian (Upper Cretaceous) strata in Colorado, Wyoming, and adjoining states - Biochronological evidence". Rocky Mountain Geology. 42 (2): 95–122. doi:10.2113/gsrocky.42.2.95.
- "Geologic Unit: Graneros". National Geologic Map Database: Geolex. United States Geologic Survey.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.
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