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Cladoceramus

Cladoceramus is an extinct genus of fossil marine pteriomorphian bivalves that superficially resembled the related winged pearly oysters of the extant genus Pteria. They lived in the Santonian stage of the Late Cretaceous.

Description
Adult shells of Cladoceramus are small to very large size (more than in length). == Biostratigraphic significance ==
Biostratigraphic significance
The first appearance of the species Cladoceramus undulatoplicatus marks the beginning of the Santonian stage. == Distribution ==
Distribution
Fossils of the genus have been found in: • Matulla Formation, Egypt ;United States • Forbes Shale, California • Smoky Hill Shale, Niobrara Formation, Colorado and New Mexico • Austin Chalk, Texas • Mancos Shale, Wyoming == References ==
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