Grass Roots Quarry: Early/Lower Barstovian, Nebraska

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Accipitriformes - Accipitridae
Geranoaetus contortus Wetmore 1924
Wetmore 1928
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
Mammalia - Perissodactyla - Equidae
Acritohippus isonesus (Cope 1889)
Mihlbachler et al. 2011
Supplemental Table S1
Neohipparion sp. Gidley 1903
Mihlbachler et al. 2011
Supplemental Table S1
Mammalia - Antilocapridae
Merycodus sabulonis (Matthew and Cook 1909)
recombined as Cosoryx (Paracosoryx) sabulonis
"Cosoryx (Paracosoryx) sp." Frick 1937: dentition compared to both M. sabulonis and "C. savaronis"; from "Quarry No. 6, Lower Snake Creek"
Mammalia - Merycoidodontidae
Brachycrus siouense (Sinclair 1915)
Schultz and Falkenbach 1940
Merychyus relictus (Matthew and Cook 1909)
Schultz and Falkenbach 1947
Mammalia - Carnivora - Canidae
Tomarctus hippophaga (Matthew and Cook 1909)
Wang et al. 1999
may also include their "Quarry 6" specimen
Mammalia - Carnivora - Amphicyonidae
Amphicyon sp. Lartet 1836
Hunt 1998
Mammalia - Rodentia - Castoridae
Amblycastor fluminus
synonym of Anchitheriomys
(sic): probably includes specimen of Stirton 1935 from "Quarry 6, Kilpatrick pasture"
see common names

Geography
Country:United States State/province:Nebraska County:Sioux
Coordinates: 42.4° North, 103.8° West (view map)
Paleocoordinates:43.0° North, 100.6° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 5
*Period:Tertiary
Key time interval:Early/Lower Barstovian
Age range of interval:16.30000 - 12.50000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Olcott
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Taxonomic list comments:East Wall Quarry (no reported fauna) is also known as Quarry No. 6, so some possibility of confusion exists
subcycle unknown
Metadata
Also known as:Quarry 6
Database number:17919
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Modifier:G. Varnham Research group:vertebrate
Created:1995-03-26 00:00:00 Last modified:2022-04-27 08:17:29
Access level:the public Released:1995-03-26 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]
1977 R. M. Hunt, Jr. 1998. Amphicyonidae. 196-227 [J. Alroy/J. Alroy/J. Alroy]
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]
3062 C. B. Schultz and C. H. Falkenbach. 1940. Merycochoerinae, a new subfamily of oreodonts. Bulletin of the American Museum of Natural History 77(5):213-306 [J. Alroy/J. Alroy/J. Marcot]
3064 C. B. Schultz and C. H. Falkenbach. 1947. Merychyinae, a subfamily of oreodonts. Bulletin of the American Museum of Natural History 88(4):157-286 [J. Alroy/J. Alroy/J. Marcot]
3558 X. Wang, R. H. Tedford, and B. E. Taylor. 1999. Phylogenetic systematics of the Borophaginae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 243:1-392 [J. Alroy/J. Alroy/J. Alroy]