Also known as Ashfall; UNSM Ap-116
Where: Antelope County, Nebraska (42.3° N, 98.0° W: paleocoordinates 42.7° N, 95.4° W)
• coordinate based on political unit
• small collection-level geographic resolution
When: Cap Rock Member (Ash Hollow Formation), Clarendonian (13.6 - 10.3 Ma)
Environment/lithology: terrestrial
Primary reference: M. R. Voorhies. 1990. Vertebrate biostratigraphy of the Ogallala Group in Nebraska. In T. C. Gustavson (ed.), Geologic Framework and Regional Hydrology: Upper Cenozoic Blackwater Draw and Ogallala Formations, Great Plains 115-151 [J. Alroy/J. Alroy/J. Marcot]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 18324: authorized by John Alroy, entered by John Alroy on 05.08.1992, edited by Anna Behrensmeyer and Patricia Holroyd
Creative Commons license: CC BY (attribution)
Taxonomic list
•">20" horse skeletons in total
•Perkins 1998 "tentatively" correlates the main ash bed with the Ibex Hollow ash bed, dated in Idaho at 11.93 +/- 0.03 Ma (SCLF Ar/Ar)
•list of Voorhies 1985 differs considerably, but in most cases because of preliminary identifications; however, "cf. Leptocyon sp." is omitted by Voorhies 1990 and is of unclear status
Angiospermae | |
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Aves | |
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Reptilia | |
Hesperotestudo orthopygia4 Cope 1878 turtle ETE number of identifiable specimens; species: Testudinidae
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Mammalia | |
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"? Protohippus simus" = Protohippus supremus4, Pliohippus pernix, Cormohipparion occidentale4, Pseudhipparion gratum, Neohipparion affine
Cormohipparion occidentale4 Leidy 1856 hipparionine horse JA pers. obs.: "Cormohipparion occidentale"; new small, short notch species
Pseudhipparion gratum Leidy 1869 hipparionine horse | |
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Procamelus grandis Gregory 1939 camel
Aepycamelus sp. Macdonald 1956 camel | |
"Merychyus novomexicanus" = Ustatochoerus medius novomexicanus1
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Longirostromeryx wellsi Matthew 1904 musk deer | |
Talpidae indet. Fischer de Waldheim 1817 mole | |
Erinaceidae indet. Fischer von Waldheim 1817 hedgehog | |
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"Phelosaccomys hibbardi" = Parapliosaccomys hibbardi3
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Hesperolagomys sp. Clark et al. 1964 pika | |
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