Region
California
Nevada
12
Inyo County
3
Los Angeles County
3
Mono County
3
Arizona
2
California, Southern
2
Cholame Region
2
Clark County
2
Esmeralda County
2
Mineral County
2
Owens Valley
2
San Andreas Fault (Calif.)
2
San Bernardino County
2
San Francisco Bay Area
2
San Jose Region
2
Beatty Region
1
Burney
1
Carrizo Plain Natural Area
1
Channel Islands Region
1
Franciscan Complex
1
Goldfield
1
Goldfield, Mariposa, and Death Valley Quadrangles
1
Humboldt County
1
Imperial Valley (Calif. and Mexico)
1
Irish Hills
1
Irish Hills (Calif.)
1
Joshua Tree National Park
1
Kern County
1
Long Valley
1
Long Valley Caldera
1
Mendocino County
1
Mojave Desert
1
Mono Lake
1
Mono Lake (Calif.)
1
Mother Lode
1
Nye County
1
Orange County
1
Oregon
1
Pacific Coast
1
Palo Alto Region
1
Parkfield Region
1
Riverside County
1
Salton Sea Region
1
San Bernardino Mountains
1
San Bernardino Valley
1
San Diego quadrangle
1
San Luis Obispo County
1
San Mateo County
1
Santa Ana quadrangle
1
more ...