Pass Peak Formation
The Pass Peak Formation is a Wasatchian geologic formation in Wyoming. It preserves fossils dating back to the Ypresian stage of the Eocene period.
Fossil content
The following fossils have been found in the formation:Mammals
;ArtiodactylsDiacodexis sp.;ErinaceomorphaDiacodon celatus
;GliresParamys copei
;Macroscelidea
;PerissodactylaHyracotherium cf. vasacciense
;Placentalia