Post Ranch: Blancan, Arizona

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Lagomorpha - Leporidae
Leporidae indet. Fischer de Waldheim 1817
? Sylvilagus bensonensis n. sp. Gazin 1942
    = Aluralagus bensonensis Gazin 1942
Alroy 2002
Hypolagus ringoldensis Gustafson 1978
White 1988
from "Benson"; "H. sp."
Mammalia - Rodentia - Cricetidae
Neotoma fossilis Gidley 1922
Sigmodon medius Gidley 1922
synonym of Sigmodon minor
Onychomys bensoni Gidley 1922
Calomys (Bensonomys) arizonae (Gidley 1922)
    = Bensonomys arizonae Gidley 1922
Alroy 2002
recombined as Calomys (Bensonomys) arizonae
Baiomys minimus (Gidley 1922)
original and current combination Peromyscus minimus
(4 measurements)
Mammalia - Rodentia - Sciuridae
Citellus bensoni Gidley 1922
    = Spermophilus bensoni Gidley 1922
Alroy 2002
recombined as Citellus (Otospermophilus) bensoni
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 - 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 - Carnivora - Mustelidae
? Mustelidae indet. Fischer 1817
Mammalia - Carnivora - Felidae
Felis sp. Linnaeus 1758
    = Felinae indet. Trouessart 1885
Alroy 2002
Mammalia - Carnivora - Hyaenidae
Chasmaporthetes ossifragus Hay 1921
Kurten and Werdelin 1988
"Benson Area, Cochise County"
Mammalia - Perissodactyla - Equidae
Nannippus cf. phlegon (Hay 1899)
    = Nannippus cf. peninsulatus Cope 1885
Alroy 2002
Plesippus sp. Matthew 1924
    = Equus sp. Linnaeus 1758
Alroy 2002
Mammalia - Antilocapridae
Antilocapridae indet. Gray 1866
"possibly Texoceros": see also Frick 1937
Mammalia - Camelidae
Camelidae indet. Gray 1821
Johnson et al. 1975
    = Camelops sp. Leidy 1854
Alroy 2002
Mammalia - Tayassuidae
Platygonus sp. Leconte 1848
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"
Reptilia - Testudines - Kinosternoidea
Kinosternon arizonense n. sp. Gilmore 1922
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
Amphibia - Temnospondyli - Urodela
Ambystoma tigrinum (Green 1825)
Brattstrom 1955
Amphibia - Temnospondyli - Bufonidae
Bufo sp. Laurenti 1768
Brattstrom 1955
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]