UCMP V-3310, Black Hawk Ranch (Miocene of the United States)

Where: Contra Costa County, California (37.8° N, 121.9° W: paleocoordinates 37.2° N, 118.2° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Green Valley Formation, Clarendonian (13.6 - 10.3 Ma)

Environment/lithology: terrestrial; siliciclastic sediments

Size class: macrofossils

Reposited in the UCMP

Primary reference: K. A. Richey. 1948. Lower Pliocene horses from Black Hawk Ranch, Mount Diablo, California. University of California Publications, Bulletin of the Department of Geological Sciences 28(1):1-44 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 19185: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• much lower in the fm. than tuff dated at 5.9 +/- 0.6 and 6.3 +/- 0.1 Ma: Tedford et al. 1987
slightly below UCMP V-3724, which yielded only a "fragment of a mastodont ulna"
Mammalia
 Rodentia - Sciuridae
Spermophilus sp.1 Cuvier 1825 ground squirrel
 Rodentia - Castoridae
"Eucastor lecontei" = Prodipoides lecontei
"Eucastor lecontei" = Prodipoides lecontei Merriam 1896 beaver
 Lagomorpha - Leporidae
Alilepus hibbardi11 White 1991 rabbit
presumably = "Hypolagus sp."
 Perissodactyla - Equidae
Hipparion forcei Richey 1948 hipparionine horse
Dinohippus cf. leardi1 Drescher 1941 horse
 Carnivora - Procyonidae
Procyonidae indet.9 Gray 1825 procyonid carnivore
 Carnivora - Barbourofelidae
Barbourofelis loveorum2 Baskin 1981 carnivoran
 Carnivora - Mustelidae
Leptarctus wortmani8 Matthew 1924 mustelid carnivore
Mustelinae indet.4 Fischer 1817 mustelid carnivore
 Carnivora - Canidae
Leptocyon vafer4 Leidy 1858 canine
Aelurodon cf. taxoides7 Hatcher 1894 bone-crushing dog
confirmed by Baskin 1998a, Wang et al. 1999; "A. cf. aphobus"; apparently includes "Osteoborus ricardoensis" (see footnote by Stirton in Richey 1948, p. 3)
Borophagus littoralis1 VanderHoof 1931 bone-crushing dog
 Carnivora - Felidae
Nimravides thinobates4 Macdonald 1948 cat
 Proboscidea - Gomphotheriidae
Gomphotherium obscurum6 Leidy 1869 gomphothere
 Ungulata - Merycoidodontidae
"Merychyus cf. major" = Ustatochoerus major3
"Merychyus cf. major" = Ustatochoerus major3 Leidy 1858 oreodont
 Ungulata - Tayassuidae
Woodburnehyus grenaderae n. gen. n. sp.5
Woodburnehyus grenaderae n. gen. n. sp.5 Prothero and Pollen 2013 peccary
 Ungulata - Camelidae
Procamelus cf. grandis Gregory 1939 camel
Aepycamelus sp.4 Macdonald 1956 camel
Pliauchenia cf. magnifontis Gregory 1939 camel
 Ungulata - Antilocapridae
Capromeryx sp.10 Matthew 1902 pronghorn
"? Merycodus"