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A broken concretion with fossils inside; Late Cretaceous Pierre Shale near Ekalaka, Montana
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.
Baculites from the Pierre Shale showing sutures and remnant aragonite; western South Dakota, Late Cretaceous.
Image: Hesperornis BW (white background)
Image: Hesperornis BW (white background)
Image: Ichthyornis restoration
Image: Ichthyornis restoration
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The Smoky Hill Chalk badlands are in the Niobrara Formation, in Kansas.
The Smoky Hill Chalk badlands are in the Niobrara Formation, in Kansas.
Monument Rocks, Smoky Hill Chalk[clarification needed]
Monument Rocks, Smoky Hill Chalk[clarification needed]
Cremnoceramus deformis is an index fossil of the Fort Hays Limestone Member.
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.
Niobrara Chalk was weathered and opalized in the Valentine phase of the Ogallala Formation.