title: Chalk Butte Formation
text: # Chalk Butte Formation
  
  The Chalk Butte Formation is a geologic formation in Oregon. It preserves fossils dating back to the Neogene period.
  
  ## Fossil content
  
  The following fossils have been reported from the formation:
  
  * Antecalomys valensis
  * Basirepomys pliocenicus
  * Copemys cf. esmeraldensis
  * Cupidinimus magnus
  * Diprionomys parvus
  * Dipoides vallicula
  * Eucyon davisi
  * Goniodontomys disjunctus
  * Hypolagus vetus
  * Peromyscus antiquus
  * Pliohippus spectans
  * Plionictis oregonensis
  * Scapanus proceridens
  * Dipoides sp.
  * Spermophilus sp.
  * Camelidae indet.
  * Perognathinae indet.
  * Soricidae indet.
  * ?Vespertilionidae indet.
  