Virgin Valley (Miocene of the United States)

Also known as UCMP 1065, 1090, 1095
DUPLICATE REF 3234 or 3235

Where: Humboldt County, Nevada (41.1° N, 117.8° W: paleocoordinates 41.9° N, 114.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Virgin Valley Formation, Barstovian (16.0 - 13.6 Ma)

• spans a rhyolite vent dated at 15.72 +/- 0.07 Ma on biotite and overlies a rhyolite with a youngest date of 16.11 +/- 0.03 on sanidine (both SLCF 40Ar/39Ar)

Environment/lithology: terrestrial

Reposited in the UCMP

Primary reference: R. A. Stirton. 1940. The Nevada Miocene and Pliocene mammalian faunas as faunal units. Proceedings of the Sixth Pacific Science Congress 2:627-640 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 19103: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• Perkins et al. 1998 indicate that the Virgin Valley section is bracketed by Ar/Ar dates of 16.28 +/- 0.02 Ma (rhyolite at base) and 15.18 +/- 0.03 Ma (ash near top)
Mammalia
 Rodentia - Aplodontidae
Liodontia alexandrae n. sp. Furlong 1910 mountain beaver
from UCMP 1090 also at UCMP 1095: see Gazin 1932 DUPLICATE REF 3234 or 3235
 Rodentia - Castoridae
Monosaulax skinneri1 Stout 1999 beaver
 Rodentia - Mylagaulidae
Alphagaulus cf. pristinus1 Douglass 1903 rodent
Hesperogaulus sp.1 Korth 1999 rodent
 Lagomorpha - Leporidae
Hypolagus parviplicatus n. sp.3 Dawson 1958 rabbit
from UCMP 1065; "H. vetus" of Dice 1917
 Lagomorpha - Ochotonidae
Oreolagus nevadensis n. sp. Kellogg 1910 pika
see Dice 1917 DUPLICATE REF 3234 or 3235
 Perissodactyla - Chalicotheriidae
Moropus merriami2 Holland and Peterson 1913 chalicothere
UCMP 1065
 Perissodactyla - Rhinocerotidae
Teleoceras medicornutum5 Osborn 1904 rhinoceros
Peraceras profectum4 Matthew 1899 rhinoceros
pers. comm.: "Aphelops"
Aphelops megalodus5 Cope 1873 rhinoceros
 Perissodactyla - Equidae
Merychippus cf. californicus Merriam 1915 horse
assigned to "M. cf. seversus" by Downs 1961, but see Hulbert and MacFadden 1991 DUPLICATE REF 3234 or 3235
Merychippus brevidontus Bode 1935 horse
first mentioned by Bode 1934 DUPLICATE REF 3234 or 3235
Desmatippus cf. avus1 Marsh 1874 anchitheriine horse
Hypohippus cf. osborni Gidley 1907 anchitheriine horse
DUPLICATE REF 3234 or 3235
 Carnivora - Procyonidae
"Probassariscus antiquus" = Bassariscus antiquus1
"Probassariscus antiquus" = Bassariscus antiquus1 Matthew and Cook 1909 ringtail
 Carnivora - Canidae
Paracynarctus kelloggi1 Merriam 1911 bone-crushing dog
Protomarctus cf. optatus1 Matthew 1924 bone-crushing dog
 Proboscidea - Mammutidae
"Zygolophodon proavus" = Mastodon proavus1
"Zygolophodon proavus" = Mastodon proavus1 Cope 1873 mastodon
 Artiodactyla - Tayassuidae
Hesperhys sp. Douglass 1903 peccary
DUPLICATE REF 3234 or 3235
 Artiodactyla - Merycoidodontidae
Ticholeptus zygomaticus1 Cope 1878 oreodont
 Artiodactyla - Palaeomerycidae
Dromomerycinae indet.1 Frick 1937 ruminant
Cranioceratini indet.1 Frick 1937 ruminant
 Artiodactyla - Antilocapridae
Paracosoryx sp.1 Janis and Manning 1998 pronghorn
 Artiodactyla - Moschidae
"Blastomeryx mollis" = Problastomeryx primus6
"Blastomeryx mollis" = Problastomeryx primus6 Matthew 1908 musk deer