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Collignoniceras woolgari or Prionocyclus hyatti

Jared C

By Jared C

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Collignoniceras woolgari or Prionocyclus hyatti

Upper Turonian

Texas

 

C. woolgari and P. hyatti both occur in the upper Turonian, as index fossils, but can be difficult to differentiate.

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Texas Turonian (Cretaceous)

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LSCHNELLE

LSCHNELLE

Posted (edited)

Looking at the Illustrated Guide to Stratigraphically Important Macrofossils in the Western Interior Basin by Kauffman, I would say Prionocyclus hyatti. C. woollgari appears to have more spread out sutures near the main body chamber.

Edited by LSCHNELLE
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