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User:Abyssal/Prehistory of North America/Selected picture/10

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Fossils of the Late Cretaceous ammonoids Hoploscaphites (left) und Discoscaphites (right)

Fossil shells of the scaphitid ammonoids Hoploscaphites (left) and Discoscaphites (right). The shell dates back to the Maastrichtian age (66–72.1 million years ago) of the Late Cretaceous epoch. The Specimen was collected in South Dakota, USA.
Photo credit: H. Zell