Post Ranch: Blancan, Arizona

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Amphibia - Temnospondyli - Urodela
Ambystoma tigrinum (Green 1825)
Brattstrom 1955
Amphibia - Temnospondyli - Bufonidae
Bufo sp. Laurenti 1768
Brattstrom 1955
Reptilia - Squamata
Crotaphytus sp. Holbrook 1843
Brattstrom 1955
see also Gilmore 1928
    = Squamata indet. Oppel 1811
Hollenshead and Mead 2006
reID'ed based on Etheridge 1958
Reptilia - Testudines - Kinosternoidea
Kinosternon arizonense n. sp. Gilmore 1922
Brattstrom 1955
Mammalia - Proboscidea - Gomphotheriidae
Gomphotheriidae indet. Hay 1922
"mastodont"; "cf. Cuvieronius sp." of Johnson et al. 1975
Anancus sp. Aymard 1855
    = Cuvieronius sp. Osborn 1923
Alroy 2002
or "Cordillerion bensonensis"
Mammalia - Rodentia - Sciuridae
Citellus bensoni Gidley 1922
    = Spermophilus bensoni Gidley 1922
Alroy 2002
recombined as Citellus (Otospermophilus) bensoni
Mammalia - Rodentia - Cricetidae
Sigmodon medius Gidley 1922
synonym of Sigmodon minor
Neotoma fossilis Gidley 1922
Baiomys minimus (Gidley 1922)
original and current combination Peromyscus minimus
(4 measurements)
Onychomys bensoni Gidley 1922
Calomys (Bensonomys) arizonae (Gidley 1922)
    = Bensonomys arizonae Gidley 1922
Alroy 2002
recombined as Calomys (Bensonomys) arizonae
Mammalia - Rodentia - Geomyidae
Nerterogeomys minor (Gidley 1922)
Cratogeomys bensoni Gidley 1922
Mammalia - Rodentia - Heteromyidae
? Prodipodomys minor (Gidley 1922)
original and current combination Dipodomys minor
Perognathus sp. Maximillian 1839
Johnson et al. 1975
    = Perognathinae indet. Coues 1875
Alroy 2002
Mammalia - Lagomorpha - Leporidae
Leporidae indet. Fischer de Waldheim 1817
Hypolagus ringoldensis Gustafson 1978
White 1988
from "Benson"; "H. sp."
? Sylvilagus bensonensis n. sp. Gazin 1942
    = Aluralagus bensonensis Gazin 1942
Alroy 2002
Mammalia - Carnivora - Mustelidae
? Mustelidae indet. Fischer 1817
Mammalia - Carnivora - Hyaenidae
Chasmaporthetes ossifragus Hay 1921
Kurten and Werdelin 1988
"Benson Area, Cochise County"
Mammalia - Carnivora - Felidae
Felis sp. Linnaeus 1758
    = Felinae indet. Trouessart 1885
Alroy 2002
Mammalia - Carnivora - Canidae
cf. Borophagus sp. Cope 1892
Johnson et al. 1975
presumably "Canidae indet."; may include B. diversidens of Wang et al. 1999 from "Three and one-half mi section... near Benson"
Mammalia - Antilocapridae
Antilocapridae indet. Gray 1866
"possibly Texoceros": see also Frick 1937
Mammalia - Tayassuidae
Platygonus sp. Leconte 1848
Mammalia - Camelidae
Camelidae indet. Gray 1821
Johnson et al. 1975
    = Camelops sp. Leidy 1854
Alroy 2002
Mammalia - Perissodactyla - Equidae
Plesippus sp. Matthew 1924
    = Equus sp. Linnaeus 1758
Alroy 2002
Nannippus cf. phlegon (Hay 1899)
    = Nannippus cf. peninsulatus Cope 1885
Alroy 2002
see common names

Geography
Country:United States State/province:Arizona County:Cochise
Coordinates: 32.0° North, 110.3° West (view map)
Paleocoordinates:32.1° North, 109.7° West
Basis of coordinate:based on political unit
Geographic resolution:small collection
Time
10 m.y. bin:Cenozoic 6
*Period:Tertiary *Epoch:Pliocene
Key time interval:Blancan
Age range of interval:4.70000 - 1.40000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:St. David
Local section:SPedr Local bed:1
Local order:bottom to top
Stratigraphy comments: "Sigmodon medius datum" of Johnson et al. 1975
dated at 3.1 +/- 0.7 Ma (FT on zircon) and in combination with paleomag firmly tied to chron C2An.3n, avg age 3.44 Ma: see Johnson et al. 1975
Lithology and environment
Environment:lacustrine indet.
Geology comments: "either a bog, marsh, pool, or small lake" (Brattstrom 1955)
Taphonomy
Modes of preservation:body
Collection methods and comments
Reason for describing collection:taxonomic analysis
Museum repositories:USNM
Taxonomic list comments:"Peromyscus sp." is omitted by Johnson et al. 1975
Metadata
Also known as:Benson sensu stricto; UA loc. 47-0
Database number:19628
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2008-03-01 17:25:06
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
1603. C. L. Gazin. 1942. The Late Cenozoic vertebrate faunas from the San Pedro Valley, Ariz. Proceedings of the United States National Museum 92:475-518 [J. Alroy/J. Alroy/L. van den Hoek Ostende]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
695 B. H. Brattstrom. 1955. Pliocene and Pleistocene amphibians and reptiles from southeastern Arizona. Journal of Paleontology 29(1):150-154 [J. Alroy/M. Sommers/J. Alroy]
26117 M. G. Hollenshead and J. I. Mead. 2006. Early Pliocene Crotaphytus and Gambelia (Squamata: Crotaphytidae) from the Panaca Formation of southeastern Nevada. Journal of Herpetology 40(4):566-569 [J. Alroy/J. Alroy]
2040 N. M. Johnson, N. D. Opdyke, and E. H. Lindsay. 1975. Magnetic Polarity Stratigraphy of Pliocene-Pleistocene Terrestrial Deposits and Vertebrate Faunas, San Pedro Valley, Arizona. Geological Society America Bulletin 86(1):5-12 [J. Alroy/J. Alroy/M. Uhen]
2194 B. Kurten and L. Werdelin. 1988. A Review of the Genus Chasmaporthetes Hay, 1921 (Carnivora, Hyaenidae). Journal of Vertebrate Paleontology 8(1):46-66 [J. Alroy/J. Alroy/J. Ju]
3632 J. A. White. 1988. The Archaeolaginae (Mammalia, Lagomorpha) of North America, Excluding Archaeolagus and Panolax. Journal of Vertebrate Paleontology 7(4):425-450 [J. Alroy/J. Alroy/J. Ju]