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San Timoteo Badlands

CA: Riverside Co.


Location of San Timoteo Badlands

The San Timoteo Badlands include several sites of differing ages: Late Blancan: Jack Rabbit Trail; Irvingtonian: El Casco and Shutt Ranch, San Timoteo Fm. (Albright 2000). Albright also listed a specimen of Mammuthus not included in those faunas, with an age of 0.78-0.99 mya.

A portion of the Jack Rabbit Trail deposits (Mt. Eden Fm.) is older than Pleistocene; only the Late Blancan Pleistocene portion (2.5-2.3 my) is reported here (Albright 2000). The Casco fauna is estimated as at about 1.3-1.4 ma, and the Shutt Ranch at about 0.99-0.78 (Albright 2000).

Taxa identified only by a generic name and a letter (e.g., Perognathus sp. A) are listed here by generic name only. Albright (2000) describes several such taxa in considerable detail.


Jack Rabbit Trail, Late Blancan

Chaetodipus/Perognathus spp.—Spiny or Silky Pocket Mice (Albright 2000)


Dipodomys spp.—Kangaroo Rats (Albright 2000)
Thomomys gidleyi—Gidley's Pocket Gopher (Albright 2000)
Mimomys (Ophiomys) sp.—Water Voles (Albright 2000)
Neotoma fossilis—Fossil Wood Rat (Albright 2000)
Peromyscus complexus—Complex Deer Mouse (Albright 2000)
Peromyscus hagermanensis—Hagerman Deer Mouse (Albright 2000: cf.)
Peromyscus maximus—Large Deer Mouse (Albright 2000)
Reithrodontomys sp.—Harvest Mice (Albright 2000)
Sigmodon minor—Dwarf Cotton Rat (Albright 2000)
Hypolagus edensis—Eden Rabbit (Albright 2000)
Sylvilagus hibbardi—Hibbard's Cottontail (Albright 2000)
Sorex leahyi—Leahy's Shrew (Albright 2000)
Erethizon cascoensis—Casco Porcupine (Albright 2000: ?)
Equus idahoensis—Idaho Horse (Albright 2000)

El Casco, Early Irvingtonian

Megalonyx sp.—Megalonyx Ground Sloths (Albright 2000)
Chaetodipus/Perognathus sp.—Spiny or Silky Pocket Mice (Albright 2000)


Dipodomys sp.—Kangaroo Rats (Albright 2000)
Thomomys sp.—Western Pocket Gophers (Albright 2000)
Microtus sp.—Voles (Albright 2000)
Mictomys kansasensis—Kansan Mictomys (Albright 2000)
Ondatra idahoensis—Idaho Muskrat (Albright 2000)
Neotoma sp.—Woodrats (Albright 2000)
Erethizon cascoensis—Casco Porcupine (Albright 2000)
Canis edwardii—Edward's Wolf (Albright 2000)
Tapirus merriami—Merriam's Tapir (Albright 2000)
Equus scotti—Scott's Horse (Albright 2000)

Equus bautistensis

Equus francescana—Francescana Horse (Albright 2000)
Odocoileus hemionus—Mule Deer (Frick 1937)

Mammoth Locality, Irvingtonian

Mammuthus imperator—Imperial Mammoth (Albright 2000: ?)

Shutt Ranch, Irvingtonian

Microtus californicus—Calafornia Vole (Albright 2000)
Neotoma fuscipes—Dusky-footed Woodrat (Albright 2000: nr.)
Sorex sp.—Long-tailed Voles (Albright 2000)

Literature: Albright 2000; Frick 1937.


Last Update: 23 Apr 2014