Mammalia

†Mammut americanum—American Mastodont (Jefferson 1991b)
†Megalonyx jeffersonii—Jefferson's Ground Sloth (Jefferson 1991b: cf.)
†Nothrotheriops shastensis—Shasta Ground Sloth (Jefferson 1991b)
Otospermophilus beecheyi—California Ground Squirrel (Jefferson 1991b: cf.)

Spermophilus beecheyi

Chaetodipus californicus—California Pocket Mouse (Jefferson 1991b)

Perognathus californicus

Dipodomys agilis—Agile Kangaroo Rat (Jefferson 1991b: cf.)
Thomomys bottae—Botta's Pocket Gopher (Jefferson 1991b)
Microtus californicus—California Vole (Jefferson 1991b: cf.)
Neotoma fuscipes—Dusky-footed Woodrat (Jefferson 1991b)
Peromyscus crinitus—Canyon Mouse (Jefferson 1991b: cf.)
Peromyscus maniculatus—Deer Mouse (Jefferson 1991b)
Reithrodontomys megalotis—Western Harvest Mouse (Jefferson 1991b)

Sylvilagus audubonii—Desert Cottontail (Jefferson 1991b: cf.)
Sylvilagus bachmani—Brush Rabbit (Jefferson 1991b)
Notiosorex crawfordi—Desert Shrew (Jefferson 1991b)
Sorex ornatus—Ornate Shrew (Jefferson 1991b)
Scapanus latimanus—Broad-footed Mole (Jefferson 1991b)
Antrozous pallidus—Pallid Bat (Jefferson 1991b)
†Canis dirus—Dire Wolf (Jefferson 1991b: cf.)
Spilogale sp.—Spotted Skunks (Jefferson 1991b: cf. gen.)
†Equus sp. (large-size)—Large Horses (Jefferson 1991b)
†Equus sp. (small-size)—Small Horses (Jefferson 1991b)
†Tapirus californicus—California Tapir (Jefferson 1991b: cf.)
†Tapirus merriami—Merriam's Tapir (Jefferson 1991b)
†Camelops sp.—American Camels (Jefferson 1991b)
†Hemiauchenia sp.—American Llamas (Jefferson 1991b)
Odocoileus hemionus—Mule Deer (Jefferson 1991b: cf.)
Antilocapra americana—Pronghorn (Jefferson 1991b)
†Bison antiquus—Ancient Bison (Jefferson 1991b: cf.)
†Bison latifrons—Giant Bison (Jefferson 1991b: cf.)