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

 * Artiodactyls
 * Diacodexis sp.
 * Erinaceomorpha
 * Diacodon celatus
 * Glires
 * Paramys copei
 * Macroscelidea
 * Adapisoricidae indet.
 * Perissodactyla
 * Hyracotherium cf. vasacciense
 * Placentalia
 * Hyopsodus cf. wortmani