Chalk Bluffs (Oligocene of the United States)

Where: Weld County County, Colorado (40.9° N, 104.9° W: paleocoordinates 42.2° N, 97.0° W)

• coordinate based on political unit

When: Oreodon beds zone, White River Formation, Orellan (33.9 - 33.3 Ma)

• "Oreodon Beds"

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: A. H. Miller and C. G. Sibley. 1942. An Oligocene hawk from Colorado. The Condor 44(1):39-40 [J. Hunter/J. Hunter/J. Hunter]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13296: authorized by John Hunter, entered by John Hunter on 18.02.2002, edited by Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Squamata - Iguanidae
Aciprion majus n. sp. Gilmore 1928 squamates
Princeton University Museum 10015 (fragmentary skull)
Aves
 Accipitriformes - Accipitridae
Buteo fluviaticus n. sp. Miller and Sibley 1942 hawk