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Résumé

An unnamed formation, exposed along the eastern side of the Carson Valley and on the western flanks of the Pine Nut Mountains, previously yielded two fossil vertebrate faunas ; the early Blancan (middle Pliocene) Buckeye Creek Local Fauna and the late Blancan (late Pliocene) Fish Spring Flat Local Fauna. A new fauna, the latest Hemphillian (earliest Pliocene) Washoe Local Fauna, is now recognized from the lowermost part of the unnamed formation of the Carson Valley-Pine Nut Mountains area. The Washoe Local Fauna includes the following taxa: Lepoides lepoides ; Hypolagus gidleyi ; Proboscidea, family indet. ; Teleoceras sp. indet. ; ?Felidae, gen. indet. ; Dinohippus or Pliohippus, sp. indet. ; Hemiauchenia sp. indet. ; and ?Cervidae, gen. indet. ; Platygonus cf. P. pearcei is added to the Buckeye Creek Local Fauna. Two new faunas, the late Blancan Wellington Hills Local Fauna and the earliest Irvingtonian (latest Pliocene) Topaz Lake Local Fauna, are provisionally recognized from an unnamed formation that is exposed along the eastern side of Antelope Valley and on the western flanks of the Wellington Hills, Douglas County, Nevada. The Wellington Hills Local Fauna includes the following taxa: Leporidae, gen. indet. ; ?Nerterogeomys sp. indet. ; ?Thomomys sp. indet. ; Spermophilus wellingtonensis n. sp. ; Marmota or Cynomys, sp. indet. ; Megalonychidae, gen. indet. ; Proboscidea, family indet. ; Felidae, gen. indet. ; Equus idahoensis; Equus sp. indet. ; and Camelidae, gen. indet. (small sp.). The Topaz Lake Local Fauna includes the following taxa: Leporidae, gen. indet. ; Ondatra ?idahoensis ; Felidae, gen. indet. ; Proboscidea, family indet.; Equus idahoensis ; Equus cf. E. giganteus ; Equus (?Dolichohippus) sp. indet. ; Hemiauchenia sp. indet. ; Camelidae, gen. indet. (large sp.) ; and Euceratherium collinum.