Fossil Sevengill Cow Shark teeth

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These fossil cow shark teeth (shown above) are from a sevengill cow shark (Notorynchus sp.), although they are similar in appearance to sixgill cow shark teeth (Hexanchus sp.). The smaller specimen is an upper lateral tooth; the larger specimen is a lower lateral tooth.

Both specimens were collected at Calvert Cliffs, Maryland USA, the “fossiliferous deposits [that] belong to the Chesapeake Group of Miocene age geological strata in the Atlantic Coastal Plain region.” Source Credit: “Calvert Cliffs, Maryland” (Maryland Geological Survey).

Fossil Collecting Tip: Plan to visit coastal marine fossil collecting localities during low tide. Consult a tide table such as the “NOAA Tide Predictions” Web page. “tideApp” provides free mobile tide predictions.

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