Thomson Quarry (Miocene of the United States)

Also known as Sheep Creek Quarry; Stonehouse Draw; Thompson Quarry

Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 43.1° N, 99.9° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: middle Member (Sheep Creek Formation), Hemingfordian (20.4 - 16.0 Ma)

• Sheep Creek Ash is dated at 16.3 +/- 0.13 Ma (SCLF AA): MacFadden et al. 1990; Woodburne 1996a uses a date of 17.0 Ma but is simply following Tedford et al. 1987; if sample is same as KA 891 of Evernden et al. 1964, it is the No. 3 ash of Skinner et al. from the top of the middle Sheep Creek Fm.

Environment/lithology: terrestrial; lithology not reported

Collected by Albert Thomson in 1923, 1925, 1938, 1947; reposited in the AMNH

• apparently all of the pre-1934 collections from the Sheep Creek Fm. sensu stricto are from this locality

•note, however, that "Sheep Creek Quarry" is also used for Trojan Quarry

Primary reference: M. F. Skinner, S. M. Skinner, and R. J. Gooris. 1977. Stratigraphy and biostratigraphy of late Cenozoic deposits in central Sioux County, western Nebraska. Bulletin of the American Museum of Natural History 158(5):263-370 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 18001: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• type of Brachyerix incertis ("Talpa incerta") is said by Matthew 1924 to be from "Thomson's B" but by Skinner et al. to be from Trojan Quarry (see)
Reptilia
 Testudines - Pantestudinidae
"Testudo angusticeps n. sp." = Geochelone (Hesperotestudo) angusticeps
"Testudo angusticeps n. sp." = Geochelone (Hesperotestudo) angusticeps Matthew 1924 turtle
Matthew 1924
Aves
 Charadriiformes - Burhinidae
Burhinus lucorum n. sp.3 Bickart 1981 thick-knee
Skinner specimen collected in 1947 from Thomson Quarry
 Falconiformes - Falconidae
Pediohierax ramenta2 Wetmore 1936 raptor
 Psittaciformes - Psittacidae
Conuropsis fratercula n. sp.13 Wetmore 1926 Carolina parakeet
"Horizon A... Sheep Creek Beds... collected in 1923 in the Snake Creek quarries... by Albert Thomson": provenance questionable according to Skinner et al.
 Gruiformes - Aramidae
Aramornis longurio n. sp.13 Wetmore 1926 limpkin
"Horizon A... collected in 1923 in the Snake Creek Quarries... by Albert Thomson"
 Accipitriformes - Accipitridae
Urubitinga enecta n. sp.12 Wetmore 1923 black hawk
new specimen collected in 1925 by Albert Thomson in "Stonehouse Draw"
Neophrontops vetustus n. sp.14 Wetmore 1943 hawk
H. J. Cook specimen collected in 1938 from "Stonehouse Draw Quarry"
Mammalia
 Rodentia - Mylagaulidae
Galbreathia novellus1 Matthew 1924 rodent
Alphagaulus vetus1 Matthew 1924 rodent
 Perissodactyla - Chalicotheriidae
Tylocephalonyx skinneri4 Coombs 1979 chalicothere
 Perissodactyla - Rhinocerotidae
Teleoceras americanum9 Yatkola and Tanner 1979 rhinoceros
Aphelops megalodus9 Cope 1873 rhinoceros
 Perissodactyla - Equidae
Merychippus primus Osborn 1918 horse
Archaeohippus penultimus n. sp. Matthew 1924 anchitheriine horse
Hypohippus sp.8 Leidy 1858 anchitheriine horse
Supplemental Table S1
 Carnivora - Amphicyonidae
Amphicyon frendens n. sp. Matthew 1924 bear-dog
Pliocyon sp.6 Matthew 1918 bear-dog
Cynelos idoneus1 Matthew 1924 bear-dog
 Carnivora - Mustelidae
Brachypsalis matutinus n. sp. Matthew 1924 mustelid carnivore
Dinogale siouxensis n. sp. Cook and Macdonald 1962 mustelid carnivore
originally described by Cook and Macdonald 1962 from Stonehouse Draw
Sthenictis bellus n. sp. Matthew 1932 mustelid carnivore
see Matthew 1932b
 Carnivora - Canidae
Osbornodon fricki11 Wang 1994 canid
Leptocyon leidyi10 Tedford et al. 2009 canine
Protomarctus optatus1 Matthew 1924 bone-crushing dog
Cynarctoides acridens1 Barbour and Cook 1914 bone-crushing dog
 Artiodactyla - Tayassuidae
Hesperhys vagrans7 Douglass 1903 peccary
 Artiodactyla - Camelidae
Protolabis saxeus n. sp. Matthew 1924 camel
Paramiolabis tenuis1 Matthew 1924 camel
 Artiodactyla - Merycoidodontidae
Brachycrus buwaldi1 Merriam 1919 oreodont
Merychyus relictus Matthew and Cook 1909 oreodont
see Schultz and Falkenbach 1947, as from both Thomson Quarry and 1921 "Sheep Creek Quarry"
 Artiodactyla - Palaeomerycidae
Sinclairomeryx riparius n. sp., "Dromomeryx scotti" = Subdromomeryx antilopinus5
Sinclairomeryx riparius n. sp. Matthew 1924 ruminant
see also Frick 1937; includes his type of "S. sinclairi"
"Dromomeryx scotti" = Subdromomeryx antilopinus5 Scott 1893 ruminant
also "D. wilsoni" type; see also Stirton 1944
 Artiodactyla - Moschidae
"Blastomeryx medius n. sp." = Blastomeryx gemmifer
"Blastomeryx medius n. sp." = Blastomeryx gemmifer Cope 1874 musk deer