PBDB Collection

Companion Quarry (Miocene of the United States)

Also known as UNSM Sx-128

Where: Sioux County, Nebraska (42.2° N, 103.7° W: paleocoordinates 42.9° N, 99.8° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Sheep Creek Formation, Late/Upper Hemingfordian (20.4 - 16.0 Ma)

• said to be late Hemingfordian and "within the lower part of the Sheep Creek Formation"; exact level within formation indeterminable

Environment/lithology: fluvial; sandstone and conglomerate

• "fluvial, cross-bedded sand and gravel"

Size classes: macrofossils, mesofossils

Reposited in the UNSM

Collection methods: bulk, salvage, sieve,

• "abundant microvertebrate remains" were salvaged and 680 kg of concentrate including "microvertebrates" was dry-screened; collection size only pertains to small mammals

Primary reference: B. E. Bailey. 2004. Biostratigraphy and biochronology of early Arikareean through late Hemingfordian small mammal faunas from the Nebraska Panhandle and adjacent areas. Paludicola 4(3):81-113 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 17889: authorized by John Alroy, entered by John Alroy on 13.10.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• Herpetotherium and other, unidentified taxa are "an artifact of reworking from the underlying Harrison Formation" and are excluded from the list

•fauna also includes "fish, common with low diversity; both amphibians and reptiles common with moderate diversity (isolated alligator teeth were the most abundant elements); birds, rare"

Show authors, comments, and common names

unclassified
-	Zapodididae indet.³ Zapodididae indet.³
Mammalia
Lagomorpha - Ochotonidae	Oreolagus nebrascensis Oreolagus nebrascensis McGrew 1941 pika
Lagomorpha - Leporidae	Hypolagus sp. Hypolagus sp. Dice 1917 rabbit
Rodentia - Zapodidae	Schaubeumys sabrae Schaubeumys sabrae Black 1958 jumping mouse
Rodentia - Sciuridae	Miospermophilus wyomingensis, Protospermophilus kelloggi Miospermophilus wyomingensis Black 1963 squirrel Protospermophilus kelloggi Black 1963 squirrel
Rodentia - Mylagaulidae	Alphagaulus vetus, Galbreathia novellus Alphagaulus vetus Matthew 1924 rodent Galbreathia novellus Matthew 1924 rodent
Rodentia - Geomyidae	Phelosaccomys sp.² Phelosaccomys sp.² Korth and Reynolds 1994 pocket gopher said to be new by Bailey 2004
Rodentia - Heteromyidae	Harrymys magnus², Peridiomys rusticus, Cupidinimus sp., Proheteromys sp., Schizodontomys sp. Harrymys magnus² Wood 1932 rodent Peridiomys rusticus Matthew 1924 rodent Cupidinimus sp. Wood 1935 rodent Proheteromys sp. Wood 1932 rodent Schizodontomys sp. Rensberger 1973 rodent
Rodentia - Castoridae	Monosaulax sp. Monosaulax sp. Stirton 1935 beaver
Perissodactyla - Equidae	Merychippus primus³ Merychippus primus³ Osborn 1918 horse
Artiodactyla - Antilocapridae	Paracosoryx wilsoni¹ Paracosoryx wilsoni¹ Frick 1937 pronghorn
Theriamorpha - Erinaceidae	Brachyerix sp. Brachyerix sp. Matthew 1933 hedgehog
Theriamorpha - Proscalopidae	Mesoscalops scopelotemos Mesoscalops scopelotemos Reed 1960 placental
Theriamorpha - Talpidae	Scalopoides isodens Scalopoides isodens Wilson 1960 mole
Theriamorpha - Soricidae	cf. Adeloblarina sp., Limnoecus sp. cf. Adeloblarina sp. Repenning 1967 red-toothed shrew "five genera"; includes a blarinine and another soricid: Bailey 1999 Limnoecus sp. Stirton 1930 shrew said to be new
Chiroptera - Vespertilionidae	cf. Myotis sp. cf. Myotis sp. Kaup 1829 vesper bat a bat

¹Alroy 2002; ²Bailey 1999; ³Czaplewski et al. 1999