Age. Latest Blancan, about 2.0 mya (Morgan and White 2005).
General Description. Sediments of the upper part of the Saint David Formation, about 15 km south of Benson (Morgan and White 2005).
Fauna.
Ambystoma mavortium—Barred Tiger Salamander (Lindsay 1984)
Spea multiplicata—Mexican Spadefoot (Lindsay 1984)
Scaphiopus hammondii
Incilius alvarius—Sonoran Desert Toad (Lindsay 1984)
Bufo
Hyla wrightorum—Arizona Tree Frog (Lindsay 1984)
Hyla eximia
Lithobates sp.—North American True Frogs (Lindsay 1984)
Rana
Terrapene sp.—Box Turtles (Lindsay 1984)
Phrynosoma sp.—Horned Lizards (Lindsay 1984)
Sceloporus sp.—Spiny Lizards (Lindsay 1984)
Plestiodon sp.—Skinks (Lindsay 1984)
Eumeces
Aspidoscelis sp.—Whiptails (Lindsay 1984)
Cnemidophorus
†Hesperotestudo sp.—Hesperotestudo Tortoises (Lindsay 1978)
Geochelone
Coluber sp.—Racers (Lindsay 1978)
†Lampropeltis intermedius—Intermediate King Snake (Lindsay 1978)
Masticophis sp.—Coachwhip Snakes (Lindsay 1978)
Pituophis catenifer—Gopher Snake (Lindsay 1984)
Pituophis melanoleucus
Crotalus molossus—Black-tailed Rattlesnake (Lindsay 1984: cf.)
Thamnophis sp.—Garter Snakes (Lindsay 1978)
†Cuvieronius bensonensis—Benson Gomphothere (Lindsay 1978)
Lindsay (1978) lists as above, but Morgan and White (2005) list as "Anancus" bensonensis, but with a footnote (p. 123): "The gompthotheriid proboscidean listed here as 'Anancus' bensonensis is almost certainly referable to another genus, although it is as yet unclear to which genus this species belongs."
†Glyptotherium arizonae—Gidley's Glyptodont
(Morgan and White 2005)
†Otospermophilus bensoni—Benson Ground Squirrel (Morgan and White 2005)
Spermophilus bensoni
†Prodipodomys idahoensis—Idaho Kangaroo Rat (Johnson et al. 1975)
Chaetodipus/Perognathus sp.—Pocket Mice (Morgan and White 2005)
Perognathus sp.
†Geomys persimilis—Hay's Pocket Gopher (Morgan and White 2005)
†Geomys (Nerterogeomys) minor—Small Pocket Gopher (Johnson et al. 1975)
Nerterogeomys minor
†Mictomys sp.—Bog Lemmings (Morgan and White 2005)
†Ondatra idahoensis—Idaho Muskrat (Johnson et al. 1975)
†Bensonomys arizonae—Arizona Benson Mouse (Johnson et al. 1975)
†Sigmodon curtisi—Curtis Cotton Rat (Johnson et al. 1975)
†Sigmodon minor—Lesser Cotton Rat (Johnson et al. 1975)
Sylvilagus sp.—Cottontails (Johnson et al. 1975)
†Sorex taylori—Taylor's Shrew (Morgan and White 2005)
†Equus sp.—Horses (Morgan and White 2005)
†Camelops sp.—American Camels (Morgan and White 2005)
Literature. Morgan and White
2005; Johnson et al. 1975;
Lindsay 1984 .
Last Update: 29 Aug 2014