Thomson Quarry: Hemingfordian, Nebraska
collected by Albert Thomson 1923, 1925, 1938, 1947

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Perissodactyla - Equidae
Merychippus primus (Osborn 1918)
(6 measurements)
Hypohippus sp. (Leidy 1858)
Mihlbachler et al. 2011
original and current combination Anchitherium (Hypohippus)
Supplemental Table S1
Archaeohippus penultimus n. sp. Matthew 1924
Mammalia - Perissodactyla - Rhinocerotidae
Teleoceras americanum (Yatkola and Tanner 1979)
Prothero 2005
Aphelops megalodus (Cope 1873)
Prothero 2005
Mammalia - Perissodactyla - Chalicotheriidae
Moropus sp. Marsh 1877
    = Tylocephalonyx skinneri Coombs 1979
Coombs 1979
Mammalia - Moschidae
Blastomeryx medius n. sp. Matthew 1924
synonym of Blastomeryx gemmifer
Mammalia - Palaeomerycidae
Sinclairomeryx riparius n. sp. (Matthew 1924)
see also Frick 1937; includes his type of "S. sinclairi"
Dromomeryx scotti Frick 1937
Frick 1937
synonym of Subdromomeryx antilopinus
also "D. wilsoni" type; see also Stirton 1944
Mammalia - Camelidae
Protolabis saxeus n. sp. Matthew 1924
Miolabis tenuis n. sp. Matthew 1924
recombined as Paramiolabis tenuis
Mammalia - Merycoidodontidae
Brachycrus wilsoni n. sp. Schultz and Falkenbach 1940
synonym of Brachycrus laticeps
see Schultz and Falkenbach 1940
Merychyus relictus (Matthew and Cook 1909)
see Schultz and Falkenbach 1947, as from both Thomson Quarry and 1921 "Sheep Creek Quarry"
Mammalia - Tayassuidae
Desmathyus validus n. sp. Matthew 1932
    = Hesperhys vagrans Douglass 1903
Matthew 1932
from "Stonehouse draw quarry, Merychippus primus zone"; Skinner et al. list "cf. D. sp." based on another specimen but nowhere mention the type
Mammalia - Carnivora - Mustelidae
Dinogale siouxensis n. sp. Cook and Macdonald 1962
originally described by Cook and Macdonald 1962 from Stonehouse Draw
Sthenictis bellus n. sp. Matthew 1932
see Matthew 1932b
Brachypsalis matutinus n. sp. Matthew 1924
Mammalia - Carnivora - Amphicyonidae
Amphicyon frendens n. sp. Matthew 1924
Amphicyon idoneus n. sp. Matthew 1924
recombined as Cynelos idoneus
Pliocyon sp. Matthew 1918
Hunt 1998
Mammalia - Carnivora - Canidae
Osbornodon fricki Wang 1994
Wang 1994
Leptocyon leidyi Tedford et al. 2009
Tedford et al. 2009
Tomarctus optatus n. sp. Matthew 1924
recombined as Protomarctus optatus
see also Wang et al. 1999
Cynarctoides mustelinus n. sp. (Matthew 1932)
synonym of Cynarctoides acridens
see Matthew 1932b, Wang et al. 1999
Mammalia - Rodentia - Mylagaulidae
Mesogaulus novellus n. sp. (Matthew 1924)
recombined as Galbreathia novellus
Mesogaulus vetus n. sp. (Matthew 1924)
recombined as Alphagaulus vetus
see also Korth 2000d (1 measurement)
Reptilia - Testudines - Testudinidae
Testudo angusticeps n. sp. Matthew 1924
recombined as Geochelone (Hesperotestudo) angusticeps
Matthew 1924
Reptilia - Charadriiformes - Burhinidae
Burhinus lucorum n. sp. Bickart 1981
Bickart 1981
Skinner specimen collected in 1947 from Thomson Quarry
Reptilia - Charadriiformes - Jacanidae
Jacanidae indet. Stejneger 1885
Becker 1987
Reptilia - Odontophoridae
Cyrtonyx cooki Wetmore 1934
Becker 1987
Reptilia - Falconidae
Pediohierax ramenta (Wetmore 1936)
Becker 1987
Reptilia - Gruiformes - Aramidae
Aramornis longurio n. sp. Wetmore 1926
Wetmore 1926
"Horizon A... collected in 1923 in the Snake Creek Quarries... by Albert Thomson"
Reptilia - Psittaciformes - Psittacidae
Conuropsis fratercula n. sp. Wetmore 1926
Wetmore 1926
"Horizon A... Sheep Creek Beds... collected in 1923 in the Snake Creek quarries... by Albert Thomson": provenance questionable according to Skinner et al.
Reptilia - Strigiformes
Strigiformes indet. Wagler 1830
Becker 1987
Reptilia - Accipitriformes - Accipitridae
Buteogallus enecta
Becker 1987
Neophrontops vetustus n. sp. Wetmore 1943
Wetmore 1943
H. J. Cook specimen collected in 1938 from "Stonehouse Draw Quarry"
Urubitinga enecta n. sp. Wetmore 1923
Wetmore 1926
new specimen collected in 1925 by Albert Thomson in "Stonehouse Draw"
see common names

Geography
Country:United States State/province:Nebraska County:Sioux
Coordinates: 42.4° North, 103.8° West (view map)
Paleocoordinates:43.1° North, 99.9° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Time
Period:Neogene Epoch:Miocene
Stage:Burdigalian 10 m.y. bin:Cenozoic 5
*Period:Tertiary
Key time interval:Hemingfordian
Age range of interval:18.50000 - 16.30000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Sheep Creek Member:middle
Local section:Snake Local bed:2
Local order:bottom to top
Stratigraphy comments: 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.
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Museum repositories:AMNH
Collectors:Albert Thomson Collection dates:1923, 1925, 1938, 1947
Collection method comments: 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
Taxonomic list comments: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)
Metadata
Also known as:Sheep Creek Quarry; Stonehouse Draw; Thompson Quarry
Database number:18001
Authorizer:J. Alroy, M. Uhen, J. Marcot Enterer:J. Alroy, J. Marcot, M. Uhen
Modifier:J. Alroy Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2008-10-29 17:44:05
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
3175. 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]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
75080 J. J. Becker. 1987. Neogene Avian Localities of North America 1-171 [M. Uhen/M. Uhen/M. Uhen]
25721 J. J. Becker. 1987. Revision of "Falco" ramenta Wetmore and the Neogene evolution of the Falconidae. Auk 104(2):270-276 [J. Alroy/J. Alroy]
28353 K. J. Bickart. 1981. A new thick-knee, Burhinus, from the Miocene of Nebraska, with comments on the habitat requirements of the Burhinidae (Aves: Charadriiformes). Journal of Vertebrate Paleontology 1(3/4):273-277 [J. Alroy/J. Alroy]
1275 M. C. Coombs. 1979. Tylocephalonyx, a new genus of North American dome-skulled chalicotheres (Mammalia, Perissodactyla). Bulletin of the American Museum of Natural History 164(1):1-64 [J. Alroy/J. Alroy/M. Uhen]
6222 C. Frick. 1937. Horned ruminants of North America. Bulletin of the American Museum of Natural History 69:1-669 [J. Alroy/J. Alroy/M. Uhen]
1977 R. M. Hunt, Jr. 1998. Amphicyonidae. 196-227 [J. Alroy/J. Alroy/J. Alroy]
2480 W. D. Matthew. 1932. New fossil mammals from the Snake Creek Quarries. American Museum Novitates 540:1-8 [J. Alroy/J. Alroy/J. Marcot]
61275 M. C. Mihlbachler, F. Rivals, N. Solounias and G. M. Semprebon. 2011. Dietary Change and Evolution of Horses in North America. Science 331:1178-1181 [J. Marcot/J. Marcot]
51726 D. R. Prothero. 2005. The Evolution of North American Rhinoceroses. 1-218 [J. Marcot/J. Marcot]
52058 R. H. Tedford, X. Wang, and B. E. Taylor. 2009. Phylogenetic Systematics of the North American Fossil Caninae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 325:1-218 [J. Marcot/J. Marcot/G. Lloyd]
6226 X. Wang. 1994. Phylogenetic systematics of the Hesperocyoninae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 221:1-207 [J. Alroy/J. Alroy/J. Alroy]
25102 A. Wetmore. 1926. An additional record for the fossil hawk Urubitinga necta. American Museum Novitates 241:1-3 [J. Alroy/J. Alroy]
25103 A. Wetmore. 1926. Descriptions of additional fossil birds from the Miocene of Nebraska. American Museum Novitates 211:1-5 [J. Alroy/J. Alroy]
25084 A. Wetmore. 1943. Two more fossil hawks from the Miocene of Nebraska. Condor 45(6):229-231 [J. Alroy/J. Alroy]