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Gypsum Ridge

CA: San Bernardino Co.


gypsum ridgeAge. Early Irvingtonian, 1.95 to 2.1 Ma (Wagner and Prothero 2001).

General Description.The site appears to represent the progradation of an alluvial fan onto a shallow lake (Wagner and Prothero 2001). Approximately 24 sites within a 55-ft stratigraphic section produced the Gypsum Ridge local fauna (Wagner and Prothero (2001).


Anaxyrus sp.—True Toads (Wagner and Prothero 2001)

Bufo sp.

Hesperotestudo campester— Flat Giant Tortoise (Wagner and Prothero 2001: cf.)
Rallus sp.—Rails (Wagner and Prothero 2001)
Uria sp.—Murres (Wagner and Prothero 2001)
Paramylodon harlani—Harlan's Ground Sloth (Wagner and Prothero 2001)
Nothrotheriops texanus—Texas Ground Sloth (Wagner and Prothero 2001)
Chaetodipus/Perognathus sp.—Spiny or Silky Pocket Mice (Wagner and Prothero 2001)

Perognathus sp.

Dipodomys sp.—Kangaroo Rats (Wagner and Prothero 2001: cf.)
†Ondatra idahoensis—Idaho Muskrat (Wagner and Prothero 2001)
Neotoma (Paraneotoma)—Paraneotoma Wood Rats (Wagner and Prothero 2001)

Paraneotoma sp.

Reithrodontomys sp.—Harvest Mice (Wagner and Prothero 2001)
Sigmodon medius—Intermediate Cotton Rat (Wagner and Prothero 2001)

Sigmodon minor medius

Erethizon sp.—Porcupines (Wagner and Prothero 2001)
Hypolagus furlongi—Furlong's Rabbit (Wagner and Prothero 2001: cf.)
Sylvilagus sp.—Cottontails (Wagner and Prothero 2001)
Bassariscus sp.—Ringtails (Wagner and Prothero 2001)
Equus sp.—Horses (Wagner and Prothero 2001)
Hemiauchenia sp.— (Wagner and Prothero 2001: cf. gen.)

Literature. Mead et al. 2005; Van Devender and King 1971; Wagner and Prothero 2001.


Last Update: 15 Apr 2015