Also known as Grant Quarry; Porter Ranch
Where: Donley County, Texas (35.0° N, 100.8° W: paleocoordinates 35.5° N, 98.3° W)
• coordinate based on political unit
• small collection-level geographic resolution
When: Clarendonian (12.5 - 9.4 Ma)
Environment/lithology: terrestrial; lithology not reported
Primary reference: R. C. Hulbert, Jr. 1989. Phylogenetic Interrelationships and Evolution of North American Late Equidae. In D. R. Prothero and R. M. Schoch (eds.), The Evolution of Perissodactyls [J. Alroy/J. Alroy/M. Uhen]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 18244: authorized by John Alroy, entered by John Alroy on 05.08.1992, edited by Jonathan Marcot
Creative Commons license: CC BY (attribution)
Taxonomic list
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Hippotherium sp.1, Neohipparion affine8, Cormohipparion fricki n. sp.14, Hipparion tehonense8, Pseudhipparion hessei n. sp.13, Pliohippus fossulatus4, Calippus placidus, Calippus martini, Calippus regulus7, Protohippus supremus7, Hypohippus affinis11
Hipparion tehonense8 Merriam 1916 hipparionine horse probably includes Nannippus "A" of Hulbert 1989 pers. commun.: JA pers. obs. 1/93
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"Cranioceras clarendonensis n. sp." = Cranioceras teres5
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Longirostromeryx clarendonensis n. sp.5
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"Merychyus novomexicanus" = Ustatochoerus medius novomexicanus1
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