Collignoniceras woolgari or Prionocyclus hyatti
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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By Jared C
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.
By Notidanodon,
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