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 - 18.5 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/P. Wagner]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 (attribution)
Taxonomic list
formation-level composite list; some records may pertain to localities south of Pine Ridge sensu stricto (e.g., Zodiolestes)
Harrison Fm. dated at 21.3 (= 21.86) Ma by Evernden et al. 1964 (KA 481); seems unreliable based on K content and percent atmospheric Ar
"devil's corkscrews" occur no higher than this level but as far down as the Monroe Creek Fm.: Hunt 1985a
beaver material reported by Martin 1987 comes from KUVP locs. 26 (Ellicott), 31, 91 (Breuger Ranch), and 115
"Cyclopidius densa" Schlaikjer 1935b: "lower Harrison southwest of Chadron"; this is said to be "Lower Miocene" by Loomis 1925 and Schlaikjer's attribution is of uncertain significance
"Promerycochoerus sp." listed by Hunt 1985a for Eagle Crag, but omitted by Tedford et al. 1987
Mammalia | |
Daphoenodon sp. Peterson 1909 bear-dog | |
Oligobunis sp. Cope 1881 mustelid carnivore
Zodiolestes sp. Riggs 1942 mustelid carnivore | |
Phlaocyon sp. Matthew 1899 bone-crushing dog
Cormocyon haydeni4 Wang et al. 1999 bone-crushing dog "Ellicott Ranch, Steer Pasture"; may include "Nothocyon sp."
Leptocyon sp. Matthew 1918 canine | |
Dinohyus sp. Peterson 1905 even-toed ungulate | |
Merychyus sp. Leidy 1858 oreodont described by Peterson 1907 and Thorpe 1937 as from the "Lower Harrison beds" of Squaw Butte; does not include the type of "Phenacocoelus munroensis" from the type Monroe Creek (see)
Phenacocoelus sp. Peterson 1907 oreodont suggested to include the type of P. typus by Schultz and Falkenbach 1947, 1950, but placed in the Monroe Creek sensu stricto by Hunt 1985a; status of additional "head of Squaw Creek" and "Squaw Butte" specimens of Peterson 1928 unclear
"Mesoreodon megalodon" = Desmatochoerus megalodon Peterson 1907 oreodont | |
Syndyoceras sp. Barbour 1905 protoceratid | |
Oxydactylus sp. Peterson 1904 camel
Stenomylus gracilis3 Peterson 1907 camel "Lower Harrison beds on the Niobrara (Running Water) River, Sioux County"; this is confirmed as below "Cork Screw beds" by Frick and Taylor 1968
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Diceratherium sp. Marsh 1875 rhinoceros | |
"Steneofiber barbouri n. sp." = Pseudopalaeocastor barbouri, Fossorcastor greeni n. sp.2, "Steneofiber fossor n. sp." = Fossorcastor fossor, Euhapsis ellicottae n. sp.2, Euhapsis breugerorum n. sp.2, Capacikala sp.
"Steneofiber barbouri n. sp." = Pseudopalaeocastor barbouri Peterson 1905 beaver
"Steneofiber fossor n. sp." = Fossorcastor fossor Peterson 1905 beaver
Euhapsis ellicottae n. sp.2 Martin 1987 beaver from KUVP Wy-115, Niobrara Co. WY according to Xu 1996 DUPLICATE REF 2414 or 2425 or 2439
Capacikala sp. Macdonald 1963 beaver |