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(unnumbered) Extinct genus - Many ammonite specimens found in the Tombigbee sand do not show well preserved suture marks. This makes it more difficult to identify the fossil to species level.

(DSM# 10672) Extinct genus - Mortoniceras is recognized by its highly ornamented shell. Its closest relatives had more smooth shells.

(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.