Hannold Hill Formation
The Hannold Hill Formation is an Early Eocene geologic unit in the western United States. It preserves the fossilized remains of the ray Myliobatis and gar.
Fossil content
The following fossils have been reported from the formation:;GliresParamys excavatus
;PantodontaCaenolambda jepseniCoryphodon armatusCoryphodon sp.
;PerissodactylaHyracotherium vasaccienseMinippus index
;PlacentaliaHyopsodus cf. wortmaniHyopsodus sp.Phenacodus sp.
;Primates