ammonites
Pine Ridge Escarpment ( of the United States)

Also known as Eagle Crag; Squaw Butte

Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 43.3° N, 98.8° W)

• coordinate based on political unit

When: Harrison Formation, Harrisonian (24.8 - 20.4 Ma)

Environment/lithology: terrestrial

Primary reference: R. H. Tedford, T. Galusha, M. F. Skinner, B. E. Taylor, R. W. Fields, J. R. Macdonald, J. M. Rensberger, S. D. Webb, and D. P. Whistler. 1987. Faunal succession and biochronology of the Arikareean through Hemphillian interval (late Oligocene through earliest Pliocene epochs) in North America. In M. O. Woodburne (ed.), Cenozoic Mammals of North America: Geochronology and Biostratigraphy 153-210 [J. Alroy/J. Alroy/J. Alroy] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 17819: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)