PBDB Collection

Grass Roots Quarry (Miocene of the United States)

Also known as Quarry 6

Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 43.0° N, 100.6° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Olcott Formation, Early/Lower Barstovian (16.3 - 12.5 Ma)

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

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 17919: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• East Wall Quarry (no reported fauna) is also known as Quarry No. 6, so some possibility of confusion exists
subcycle unknown

Show authors, comments, and common names

Mammalia
Rodentia - Castoridae	"Amblycastor fluminus" = Anchitheriomys "Amblycastor fluminus" = Anchitheriomys beaver (sic): probably includes specimen of Stirton 1935 from "Quarry 6, Kilpatrick pasture"
Carnivora - Canidae	Tomarctus hippophaga⁵ Tomarctus hippophaga⁵ Matthew and Cook 1909 bone-crushing dog may also include their "Quarry 6" specimen
Carnivora - Amphicyonidae	Amphicyon sp.¹ Amphicyon sp.¹ Lartet 1836 bear-dog
Perissodactyla - Equidae	Neohipparion sp.², Acritohippus isonesus² Neohipparion sp.² Gidley 1903 hipparionine horse Supplemental Table S1 Acritohippus isonesus² Cope 1889 horse Supplemental Table S1
Artiodactyla - Merycoidodontidae	Merychyus relictus⁴, Brachycrus siouense³ Merychyus relictus⁴ Matthew and Cook 1909 oreodont Brachycrus siouense³ Sinclair 1915 oreodont
Artiodactyla - Antilocapridae	Merycodus sabulonis Merycodus sabulonis Matthew and Cook 1909 pronghorn "Cosoryx (Paracosoryx) sp." Frick 1937: dentition compared to both M. sabulonis and "C. savaronis"; from "Quarry No. 6, Lower Snake Creek"
Aves
Accipitriformes - Accipitridae	Geranoaetus contortus⁶ Geranoaetus contortus⁶ Wetmore 1924 buzzard-eagle 1927 Thomson collection from "the lower Snake Creek beds (Upper Miocene) on Olcott Hill": Thomson's 1925 - 1927 "Lower Snake Creek"/Miocene collections were from Grass Roots Quarry, see Skinner et al. 1977 p. 282, 336, 337

¹Hunt 1998; ²Mihlbachler et al. 2011; ³Schultz and Falkenbach 1940; ⁴Schultz and Falkenbach 1947; ⁵Wang et al. 1999; ⁶Wetmore 1928