Steepside Quarry (Miocene of the United States)

Also known as UALP 7611; UCMP V-6604

Where: San Bernardino County, California (34.8° N, 117.0° W: paleocoordinates 34.1° N, 112.3° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Middle Member (Barstow Formation), Barstovian (16.0 - 13.6 Ma)

Environment/lithology: terrestrial

Primary reference: E. H. Lindsay. 1972. Small mammal fossils from the Barstow Formation, California. University of California Publications in Geological Sciences 93:1-104 [J. Alroy/J. Alroy/J. Alroy]more details

PaleoDB collection 19557: authorized by John Alroy, entered by John Alroy on 19.05.2000, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• lower "Cupidinimus nebraskensis assemblage zone"
generalized "Green Hills Fauna" records of Woodburne et al. 1990, unless otherwise stated: Osbornodon fricki Wang 1994: Green Hills; Third Division; Lower Green Hills Euoplocyon brachygnathus Wang et al. 1999: Green Hills Cynarctoides sp. Tomarctus hippophaga Wang et al. 1999: Green Hills; "first layer" and "second layer above Third Division"; "Lower Second Division" Pliocyon medius Berta and Galiano 1984: said to be an undescribed F:AM specimen; from "Green Hills fauna" Merychippus cf. insignis Hesperhys sp. Cynorca occidentale - not discussed by Woodburne 1969 "Merychyus cf. relictus" Schultz and Falkenbach 1968: "'Green Hills' or 'Second Division'"; not discussed by Kelly and Lander 1988, who do not recognize this species in California Miolabis aff. fissidens Protolabis cf. barstowensis Michenia sp. Aepycamelus sp. - confirmed by Kelly 1992a Rakomeryx raki Frick 1937: type, "Dromomeryx or Cervus" of Merriam 1919, from "Green Hills" Rakomeryx jorakianus Frick 1937: type, "Lower Green Hills" Merriamoceros ("Ramoceros") coronatus Frick 1937: "Green Hills, indefinite locality" Merycodus ("Meryceros") cf. joraki - from "Lower Green Hills" and "Green Hills": Frick 1937, p. 443
"Peridiomys sp." is listed in a table by Lindsay 1972 but is placed at UCMP V-6605 in the text
Mammalia
 Rodentia - Sciuridae
Miospermophilus sp. Black 1963 squirrel
 Rodentia -
Geomyoidea indet.1 Bonaparte 1845 rodent
 Rodentia - Geomyidae
Mojavemys alexandrae n. sp. Lindsay 1972 pocket gopher
Mojavemys lophatus Lindsay 1972 pocket gopher
 Rodentia - Heteromyidae
Perognathus furlongi Gazin 1930 pocket mouse
Perognathus minutus James 1963 pocket mouse
"Perognathoides halli" = Cupidinimus halli Wood 1936 rodent
Cupidinimus lindsayi n. sp.1 Barnosky 1986 rodent
 Rodentia - Cricetidae
Copemys pagei Shotwell 1967 mouse
 Lagomorpha - Leporidae
Hypolagus fontinalis1 Dawson 1958 rabbit
 Theriamorpha - Erinaceidae
"Brachyerix incertis" = Metechinus fergusoni6
"Brachyerix incertis" = Metechinus fergusoni6 Henshaw 1942 hedgehog
 Theriamorpha - Soricidae
Limnoecus tricuspis Stirton 1930 shrew
 Placentalia -
Chiroptera indet. Blumenbach 1779 bat
a bat
 Perissodactyla - Equidae
Acritohippus stylodontus5 Merriam 1919 horse
Supplemental Table S1
 Artiodactyla - Tayassuidae
Dyseohyus fricki9 Stock 1937 peccary
 Artiodactyla - Palaeomerycidae
Dromomerycinae indet.1 Frick 1937 ruminant
 Artiodactyla - Antilocapridae
"Ramoceros coronatus" = Merriamoceros coronatus2
"Ramoceros coronatus" = Merriamoceros coronatus2 Merriam 1913 pronghorn
 Artiodactyla - Merycoidodontidae
"Brachycrus buwaldi" = Brachycrus laticeps7
"Brachycrus buwaldi" = Brachycrus laticeps7 Douglass 1900 oreodont
 Carnivora - Amphicyonidae
Amphicyon cf. ingens4 Matthew 1924 bear-dog
 Carnivora - Ursidae
Plithocyon sp.3 Ginsburg 1955 bear
said to be new
 Carnivora - Canidae
Microtomarctus conferta8 Matthew 1918 bone-crushing dog
Paracynarctus kelloggi8 Merriam 1911 bone-crushing dog
Euoplocyon brachygnathus8 Douglass 1903 bone-crushing dog
Tomarctus hippophaga8 Matthew and Cook 1909 bone-crushing dog
presumably includes "T. rurestris" of Woodburne et al. 1990