Naturita Formation List of the Mesozoic life of Utah List of prehistoric mammals Alphadontidae Stagodontidae Asiatherium Pappotherium Sinodelphys Atokatheridium Chulpasia Andinodelphys Australohyaena Deltatheroides Gurlin Tsav skull Arminiheringia Deltatheridium Peratherium Fredszalaya Siamoperadectes Antarctodolops Herpetotherium Polydolopimorphia Scalaridelphys Arcantiodelphys Unnuakomys Argyrolagus Prothylacinus Proborhyaenidae Deltatheroida Mimoperadectes Oklatheridium Albertatherium Nanocuris Anatoliadelphys Hondalagus Mayulestes Paraborhyaena Proborhyaena Herpetotheriidae Patagosmilus Tsagandelta Callistoe Holoclemensia Gurbanodelta Maastrichtidelphys Lotheridium Eodelphis Pharsophorus Alphadon Pu…

ucadelphys Peradectes Borhyaena Peradectidae Bonapartherium Protalphadon Thylacosmilidae Cladosictis Borhyaenidae Hondonadia Deltatheridiidae Epidolops Sulestes Amphiperatherium Thylacosmilus Sparassodonta Didelphodon