Pennsylvanian Eugeneodontid Shark Tooth

Caseodus sp.

Class Chondrichthyes, Subclass Elasmobranchii, Order Eugeneodontida

Geological Time: Upper Pennsylvanian, Missourian Stage, (~300 million years ago)

Size (25.4 mm = 1 inch): Shark Tooth 14 mm; Matrix: 40 mm by 40 mm

Fossil Site: Stark Shale, Kansas City, Missouri

Fossil Code: VE033

Price: $125.00

Campodus Shark ToothThe late Pennsylvanian and early Permian dark shale deposits of the Midwest have produced some exceptional examples of fossils of the elasmobranches, the grouping to which sharks and rays belong. These horizons are the result of deep water deposits during marine transgressions into the interior of the continent that are known as cyclothems. These black shales represent deposition in a low to no oxygen environment which allowed for exceptional preservation of specimens that were free from predation and scavenging. This is a fine example of a tooth from a Eugeneodontid shark known as Caseodus. These sharks are believed to have led a duraophagous existence, using their teeth to crush the shells of such invertebrates as ammonites and brachiopods.

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