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Pierre Shale

The Pierre Shale is a geologic formation or series in the Upper Cretaceous which occurs east of the Rocky Mountains in the Great Plains, from Pembina Valley in Canada to New Mexico.

Mineral resources
The Pierre Shale is the host formation for commercial petroleum deposits in the Florence and Cañon City fields in Fremont County, Colorado, and the Boulder Oil Field in Boulder County, Colorado. More recently, natural gas has been extracted in the Raton Basin in southern Colorado. The shale formation is usually too impermeable for hydrocarbon extraction, but produces in areas where it is naturally fractured or fractured by artificial means. ==Paleofauna==
Paleofauna
Reptiles Dinosaurs Mosasaurs Plesiosaurs Pterosaurs Turtles Fish Bony fish Cartilaginous fish Marine vertebratesGillicusPseudocoraxCarcharias Invertebrates Annelids Arthropods Bivalves Brachiopods Cephalopods Echinoderms Gastropods Scaphopods ==References==
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