Cretodus is an extinct lamniform shark genus that is known from the Albian–Santonian marine deposits nearly worldwide with three recognized categories: the longiplicatus/emiplicatus-grade, the gigantea/houghtonorum-grade, and the crassidens-grade Cretodus. FHSM VP-19857 is a Cretodus tooth housed in the Sternberg Museum of Natural History in Kansas, USA. It occurred from the upper part of the Fairport Chalk Member (mid-Middle Turonian) of the Carlile Shale in Hamilton County, Kansas. This specimen is significant because it represents the geologically latest occurrence of the longiplicatus/semiplicatus-grade Cretodus in Kansas and further supports the hypothesis that Cretodus (at least members of the longiplicatus/semiplicatus- and gigantea/houghtonorum-grades) preferred nearshore environments.
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25 November 2024
The Extinct Shark Genus Cretodus (Lamniformes: Pseudoscapanorhynchidae) from the Uppermost Part of the Upper Cretaceous Fairport Chalk in Kansas, USA, and Its Stratigraphic and Ecological Significance
Antonio G. Armagno,
Kenshu Shimada
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Carlile Shale
Fairport Chalk
fossil
lamniform
Western Interior Seaway