head of Rock Creek, Mayfield Ranch (Pleistocene of the United States)

Also known as Equus scotti (Horse) Quarry; Evans and Meade Locality 6 (in part); Sloth-Camel (Mylodon-Camel) Quarry, TMM 31205

Where: Briscoe County, Texas (34.5° N, 101.4° W: paleocoordinates 34.5° N, 101.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tule Formation, Irvingtonian (1.8 - 0.3 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Collected by WPA in 1941; reposited in the TMM

Collection methods: quarrying, surface (float), surface (in situ),

Primary reference: E. D. Cope. 1893. A preliminary report on the vertebrate paleontology of the Llano Estacado. Fourth Annual Report of the Geological Survey of Texas 1892:11-136 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 20498: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Evangelos Vlachos

Creative Commons license: CC BY (attribution)

Taxonomic list

• about 5m below Lava Creek B (=Pearlette Type O) Ash, dated at 0.60 (= 0.62) +/- 0.014 Ma (KA on sanidine) by Naeser et al. 1973
Equus scotti Quarry is 3 or 4 m below Sloth-Camel Quarry (SCQ), but the fauna entire fauna except Stegomastodon is represented at SCQ: Schultz 1990b
originally described by Troxell 1915a; field work reported by Gidley 1903
"Glyptotherium arizonae" is listed by Kurten and Anderson 1980: probably = "Glyptodon"; but omitted by Schultz 1986 and Dalquest and Schultz 1992
Reptilia
 Testudines - Pantestudinidae
Testudo hexagonata n. sp. Cope 1893 turtle
TMM 30967-1817 (holotype), shell fragments (Hay 1908, figs. 625–626; Auffenberg 1962a, figs. 1–2).
Testudo laticaudata n. sp. Cope 1893 turtle
TMM 41412-2 (holotype), a right epiplastron and xiphiplastron (Cope 1893, pl. 22; Hay 1908, figs. 623–624)
Mammalia
 Lagomorpha - Leporidae
Sylvilagus hibbardi2 White 1984 cottontail rabbit
 Perissodactyla - Equidae
Equus sp.1 Linnaeus 1758 horse
Equus major DeKay 1842 horse
Equus calobatus n. sp.3 Troxell 1915 horse
at Sloth-Camel Quarry, see Troxell 1915a; see also Hibbard 1970c
Equus scotti n. sp.3 Gidley 1900 horse
from "head of Rock Creek" also at Equus scotti Quarry: Troxell 1915a
Equus excelsus Leidy 1858 horse
"Equus tau" = Plesippus simplicidens Cope 1892 horse
 Carnivora - Ursidae
Arctodus simus5 Cope 1879 giant short-faced bear
SCQ and isolated specimen
 Carnivora - Canidae
Canis armbrusteri4, Canis latrans4, "Canis texanus n. sp." = Xenocyon texanus3
Canis armbrusteri4 Gidley 1913 canine
Canis latrans4 Say 1823 coyote
"Canis texanus n. sp." = Xenocyon texanus3 Troxell 1915 canine
 Xenarthra - Mylodontidae
"Paramylodon harlani" = Paramylodon harlani3, "Mylodon ? sodalis" = Paramylodon harlani
"Paramylodon harlani" = Paramylodon harlani3 Owen 1840 Harlan's ground sloth
at Mylodon-Camel Quarry: Troxell 1915a
"Mylodon ? sodalis" = Paramylodon harlani Owen 1840 Harlan's ground sloth
 Proboscidea - Gomphotheriidae
"Stegomastodon barbouri" = Morrillia barbouri3
"Stegomastodon barbouri" = Morrillia barbouri3 Osborn 1921 gomphothere
 Proboscidea - Elephantidae
"Elephas primigenius" = Mammuthus primigenius, Mammuthus hayi1
"Elephas primigenius" = Mammuthus primigenius Blumenbach 1799 wooly mammoth
Mammuthus hayi1 Barbour 1915 mammoth
 Ungulata - Tayassuidae
Platygonus vetus2 Leidy 1882 peccary
 Ungulata - Camelidae
"Camelops sulcatus n. sp." = Camelops hesternus3, "Holomeniscus sulcatus" = Camelops hesternus, "Tanupolama macrocephala" = Hemiauchenia macrocephala3, "Holomeniscus macrocephalus" = Hemiauchenia macrocephala
"Camelops sulcatus n. sp." = Camelops hesternus3 Leidy 1873 camel
H & D list "C. hesternus", no justification
"Holomeniscus sulcatus" = Camelops hesternus Leidy 1873 camel
"Tanupolama macrocephala" = Hemiauchenia macrocephala3 Cope 1893 camel
"Holomeniscus macrocephalus" = Hemiauchenia macrocephala Cope 1893 camel
 Ungulata - Bovidae
"? Preptoceras mayfieldi n. sp." = Soergelia mayfieldi3
"? Preptoceras mayfieldi n. sp." = Soergelia mayfieldi3 Troxell 1915 antelope
 Ungulata - Antilocapridae
Hayoceros falkenbachi2 Frick 1937 pronghorn
"Hayoceros sp. or Tetrameryx" of Schultz 1986; "Texoceros shuleri" of Frick 1937