East Surface Quarry (Miocene of the United States)

Also known as Quarry A; Quarry 2; Sinclair Q. No. 2

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: subcycle 3 Member (Olcott Formation), Hemingfordian (20.4 - 16.0 Ma)

Environment/lithology: terrestrial

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 17904: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• exactly equivalent to "Quarry A"
Reptilia
 Testudines - Panchelydridae
"Chelydrops stricta n. sp." = Macrochelys stricta
"Chelydrops stricta n. sp." = Macrochelys stricta Matthew 1924 alligator snapping turtle
Matthew 1924: testudinid
Mammalia
 Rodentia - Castoridae
Anchitheriomys fluminis1 Matthew 1918 beaver
 Perissodactyla - Rhinocerotidae
Teleoceras medicornutum5 Osborn 1904 rhinoceros
"Quarry #2, East Sinclair Draw"
Aphelops megalodus5 Cope 1873 rhinoceros
 Perissodactyla - Equidae
Scaphohippus intermontanus4 Merriam 1915 horse
Supplemental Table S1: "Quarry 2"
Merychippus insignis4 Leidy 1856 horse
Supplemental Table S1: "Quarry 2"
Neohipparion sp.4 Gidley 1903 hipparionine horse
Supplemental Table S1
Acritohippus isonesus4 Cope 1889 horse
Supplemental Table S1
Hypohippus osborni1 Gidley 1907 anchitheriine horse
 Carnivora - Procyonidae
Bassariscus antiquus2 Matthew and Cook 1909 ringtail
F:AM 25251 from "Quarry 2": I assume this means Sinclair Quarry No. 2,but it could also be East Surface Quarry or Trojan Quarry
 Carnivora - Amphicyonidae
Pliocyon medius n. sp. Matthew 1918 bear-dog
Cynelos sinapius1 Matthew 1902 bear-dog
 Carnivora - Mustelidae
Mionictis incertus n. sp. Matthew 1924 badger
 Carnivora - Canidae
Microtomarctus conferta6 Matthew 1918 bone-crushing dog
"Quarry A"
Tomarctus brevirostris6 Cope 1873 bone-crushing dog
"Quarry A"
Tomarctus hippophaga6 Matthew and Cook 1909 bone-crushing dog
"Quarry A"
 Artiodactyla - Camelidae
Aepycamelus procerus n. sp. Matthew and Cook 1909 camel
"Thomson [MS.a] gave the locality as "Quarry 2,..."; "There is no doubt that the type of A. procerus is from the Olcott Formation."
 Polyprotodonta - Herpetotheriidae
Ticholeptus zygomaticus1 Cope 1878 oreodont
 Polyprotodonta - Palaeomerycidae
"Dromomeryx whitfordi" = Dromomeryx borealis3
"Dromomeryx whitfordi" = Dromomeryx borealis3 Cope 1877 ruminant
"Quarry A"
 Polyprotodonta - Antilocapridae
Merycodus sabulonis Frick 1937 pronghorn
"Cosoryx (Paracosoryx) sp." Frick 1937: dentitions compared to both M. sabulonis and "C. savaronis"; from "Quarry A, Sinclair Draw"