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

dolops Deltatheridiidae Amphiperatherium Alphadon Thylacosmilidae Protalphadon Hondonadia Borhyaenidae Peradectes Borhyaena Pucadelphys Peradectidae Cladosictis Thylacosmilus Sparassodonta Didelphodon