Hoploscaphites
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Hoploscaphites is an extinct ammonite genus from the Upper Cretaceous and the Lower Paleocene, included in the family Scaphitidae.
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.
Image: Hesperornis BW (white background)
Image: Ichthyornis restoration