McKay Formation

McKay Formation
McKay Formation
Stratigraphic range: Tortonian-Zanclean (Hemphillian); ~
Type	Formation
Lithology
Primary	Tuffaceous sandstone
Location
Coordinates	45°30′N 118°48′W / 45.5°N 118.8°W / 45.5; -118.8
Approximate paleocoordinates	45°24′N 116°06′W / 45.4°N 116.1°W / 45.4; -116.1
Region	Umatilla County, Oregon
Country	United States
Type section
Named for	McKay Reservoir
	McKay Formation (the United States)Show map of the United States McKay Formation (Oregon)Show map of Oregon

The McKay Formation is a geologic formation in Oregon. It preserves fossils dating back to the Tortonian to Zanclean stages (Hemphillian) of the Neogene period.¹²³

Fossil content

The following fossils have been reported from the formation:¹⁴

Cricetidae
- Antecalomys cf. valensis
- Basirepomys pliocenicus
- Copemys esmeraldensis
- Peromyscus antiquus
- Prosomys mimus
Aplodontidae
- Liodontia sp.
Sciuridae
- Parapaenemarmota oregonensis
- Spermophilus mckayensis
- S. wilsoni
- Neotamias sp.
Eomyidae
- Leptodontomys oregonensis
Geomyidae
- Parapliosaccomys oregonensis
Perognathinae indet.
Dipodomyinae indet.
Heteromyidae
- Oregonomys sargenti
Castoridae
- Castor sp.
- Dipoides smithi
Mylagaulidae
- Hesperogaulus wilsoni
Zapodidae
- Pliozapus solus
Leporidae
- Hypolagus oregonensis
Ochotonidae
- Ochotona spanglei