Pierre Shale
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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.
A broken concretion with fossils inside; Late Cretaceous Pierre Shale near Ekalaka, Montana
Baculites from the Pierre Shale showing sutures and remnant aragonite; western South Dakota, Late Cretaceous.
Hesperornis BW
Ichthyornis restoration
Niobrara Formation
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The Niobrara Formation, also called the Niobrara Chalk, is a geologic formation in North America that was deposited between 87 and 82 million years ago during the Coniacian, Santonian, and Campanian s
Pierre Shale
…with veins and seams of gypsum, and concretions of iron oxide. The Pierre Shale is about 3,138 feet (956m) thick at the type locality. It overlies the Niobrara division and underlies the Fox Hills beds. It was named for an occurrence near Fort Pierre on the Missouri River in South Dakota. The Pierre Shale is…
The Smoky Hill Chalk badlands are in the Niobrara Formation, in Kansas.
Monument Rocks, Smoky Hill Chalk Member of Niobrara formation
Cremnoceramus deformis is an index fossil of the Fort Hays Limestone Member.
Niobrara Chalk was weathered and opalized in the Valentine phase of the Ogallala Formation.