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; -118.8Coordinates: 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) McKay Formation (Oregon) Show map of the United StatesShow map of OregonShow all

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]

Fossil content[]

Epicyon

Eucyon davisi

Platygonus

Machairodus

Restoration of Teleoceras

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

Mammals[]

Rodents

• Cricetidae
  • Basirepomys pliocenicus
• Aplodontidae
• Sciuridae
  • Neotamias sp.
• Eomyidae
• Geomyidae
• Perognathinae indet.
• Dipodomyinae indet.
• Heteromyidae
• Castoridae
  • Castor sp.
  • Dipoides smithi
• Mylagaulidae
• Zapodidae
• Leporidae
  • Hypolagus oregonensis
• Ochotonidae
  • Ochotona spanglei

Lipotyphla

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

Perissodactyla

• Rhinocerotidae
  • Teleoceras hicksi
• Equidae
  • Hipparionini indet.

• Chiroptera indet.

Carnivora

• Mustelidae
  • Plesiogulo marshalli
  • Mustela sp.
• Canidae
  • Epicyon saevus
  • Eucyon davisi
• Felidae
  • Machairodus sp.

Proboscidea

• Mammutidae
  • ?Mammutidae indet.

Artiodactyls

• Tayassuidae
  • Platygonus brachirostris
• Camelidae
  • Camelidae indet.

Birds[]

• Scolopacidae
• Odontophoridae
• Anatidae

See also[]

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

References[]

Bibliography[]

• 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.