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)
Taxonomic list
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Oregonomys pebblespringsensis3 Martin 1984 rodent UWBM C0122, C0123, C0124 DUPLICATE REF 2411 or 2424
Perognathus stevei3 Martin 1984 pocket mouse UWBM C0122, C0124; "P. sp."; DUPLICATE REF 2411 or 2424
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Dipoides sp. Jaeger 1835 beaver | |
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Teleoceras sp. Hatcher 1894 rhinoceros | |
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Mammut sp. Blumenbach 1799 mastodon |