Also known as UO 2323; UWBM C0122 (Arlington 9), C0123 (Arlington 10), C0124 (Arlington 11)

Where: Gilliam County, Oregon (45.7° N, 120.2° W: paleocoordinates 45.6° N, 117.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Alkali Canyon Formation, Hemphillian (10.3 - 4.9 Ma)

• "relatively thin stratigraphic unit"; see Martin 1998 for stratigraphic nomenclature

• member-level stratigraphic resolution

Environment/lithology: terrestrial; unlithified, tuffaceous sandstone and tuff

Size class: macrofossils

Collection methods: surface (float),

• "collection on hands and knees" from a blowout

Primary reference: J. A. Shotwell. 1958. Inter-community relationships in Hemphillian (mid-Pliocene) mammals. Ecology 39(2):271-282 [J. Alroy/J. Alroy/W. Clyde]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 18940: authorized by John Alroy, entered by John Alroy on 27.09.1993

Creative Commons license: CC BY (attribution)