Clarno Nut Beds (Eocene of the United States)

Also known as UCMP V-4203, V-62403, V-65513, V-78127

Where: Wheeler County, Oregon (44.9° N, 120.2° W: paleocoordinates 47.7° N, 102.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Unit B Member (Clarno Formation), Bridgerian (50.3 - 46.2 Ma)

• said to be Bridgerian

Environment/lithology: terrestrial

Reposited in the UCMP

Primary reference: C. B. Hanson. 1996. Stratigraphy and vertebrate faunas of the Bridgerian-Duchesnean Clarno Formation, north-central Oregon. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 206-239 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 16202: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

• see also Fremd et al. 1994
NISP 28
maintained as a single list because UCMP V-4203 is not discussed and UCMP V-65513 is a general locality that does include key specimens
about 100 m below Hancock Quarry
best date is 48.32 +/- 0.11 Ma (SCLF AA on plagioclase); a second AA determination of 43.8 +/- 0.31 Ma apparently includes multiple crystal populations, and two FT dates on zircon have broad errors that overlap with the 48.32 Ma date
see also Krishtalka et al. 1987
Reptilia
 Testudines - Pantestudinidae
Hadrianus sp. Cope 1872 turtle
 Loricata -
Pristichampsus sp. Gervais 1853 crocodilian
Mammalia
 Perissodactyla - Brontotheriidae
Xylotitan cenosus n. gen. n. sp.2
Xylotitan cenosus n. gen. n. sp.2 Mihlbachler and Samuels 2016 brontothere
said to be new; UCMP V-65513
 Perissodactyla - Hyrachyidae
Hyrachyus eximius Leidy 1871 odd-toed ungulate
UCMP V-4203 (Clarno Bridge)
 Perissodactyla - Equidae
Xenicohippus craspedotum1 Cope 1880 horse
 Creodonta - Oxyaenidae
Patriofelis ferox Marsh 1872 creodont
UCMP V-78127