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- Title is exactly "<em>Mortoniceras</em> aff. <em>M. texanum</em> (Roemer 1852) Ammonite"
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Mortoniceras aff. M. texanum (Roemer 1852) Ammonite
(DSM# FK101) Extinct genus of ammonite.
Mortoniceras aff. M. texanum (Roemer 1852) Ammonite
(DSM# 10676) Extinct genus - Mortoniceras is commonly known from sediments of the Western Interior Seaway. The seaway was a wide swath of sea that roughly cut North America in half north to south during the Cretaceous and early Paleocene periods.