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| TITLE: | Hyaenodontidae (Creodonta, Mammalia) from the Early Eocene Four Mile Fauna and their biostratigraphic implications
| | AUTHOR: | Paul David Polly
| | JOURNAL: | PaleoBios
| | PUBLISHED: | Apr 23, 1993
| | NOTES: | 14(4)
| | ABSTRACT: | Hyaenodontid creodonts from the Four Mile Local Fauna of northwestern Colorado are reexamined in light of recent work in the Bighorn and Clarks Fork Basins. Prototomus phobos, P. martis, P. secundarius, P. robustus, P. deitnos, Arfia opisthotoma, A. shoshoniensis, Prolimnocyon haetnatus, and Acarictis ryani are now known from Four Mile. Acarictis, previously known only from lower teeth, is now known from an upper molar. These taxa suggest that the Four Mile Fauna is early Wasatchian in age and corroborate a Wa2 or Wa3 biochronologic age assignment. The species Prototomus secundarius and P. robustus initially suggest a Wa5 age for the Sand Quarry locality, but evidence provided by Gunnell (1989) suggests that this locality is actually Wa2 or Wa3 in age and the presence of these two species at Sand Quarry represents a biostratigraphic range extension. It is possible that the two species, which are significantly larger than other species of Prototomus, may have been in competition or ecologically partitioned from the similar sized species Arfia shoshoniensis and A. opisthotoma. The former two species do not co-occur with the latter two species at any locality. The presence of Arfia in Wa2 and Wa3 at localities in the Bighorn Basin may explain the absence of Prototomus robustus and P. secundarius there.
| | COLLECTION: | PaleoBios Archive Public
| | ID: | 223
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