McKay Formation

McKay Formation
Stratigraphic range: Tortonian-Zanclean (Hemphillian) ~10.3–4.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
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.^[1][2][3]

The following fossils have been reported from the formation:^[1][4]

Rodents

• 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

Lipotyphla

• Talpidae
  • Gaillardia thomsoni
  • ?Neurotrichus columbianus
  • Scapanus cf. proceridens
  • Scapanus sp.
  • ?Scalopoides sp.

Perissodactyla

• Rhinocerotidae
  • Teleoceras hicksi
• Equidae
  • Hipparionini indet.

• Chiroptera indet.

Carnivora

• Mustelidae
  • Plesiogulo marshalli
  • Pliotaxidea nevadensis
  • Mustela sp.
• Canidae
  • Epicyon saevus
  • Eucyon davisi
• Felidae
  • Lynx longignathus
  • Machairodus sp.

Proboscidea

• Mammutidae
  • ?Mammutidae indet.

Artiodactyls

• Tayassuidae
  • Platygonus brachirostris
• Camelidae
  • Camelidae indet.

• Scolopacidae
  • Bartramia umatilla
• Odontophoridae
  • Callipepla shotwelli
• Anatidae
  • Nettion bunkeri

• List of fossiliferous stratigraphic units in Oregon
• Paleontology in Oregon

• Shotwell, J. A (1956). "Hemphillian mammalian assemblage from northeastern Oregon". Geological Society of America Bulletin. 67 (6): 717. Bibcode:1956GSAB...67..717S. doi:10.1130/0016-7606(1956)67[717:HMAFNO]2.0.CO;2.