Region
California
23
Nevada
14
Alaska
4
Monterey Formation (Calif.)
4
Nye County
4
Oregon
4
Santa Maria Basin
4
Arizona
3
Colorado
3
Enewetak Atoll
3
Marshall Islands
3
Utah
3
Cook Inlet Region
2
Kern County
2
Lospe Formation (Calif.)
2
Lyon County
2
Monterey Formation
2
Nebraska
2
North Carolina
2
Orange County
2
Puerto Rico
2
San Juan Mountains (Colo. and N.M.)
2
Santa Maria Basin (Calif.)
2
Washington (State)
2
Wyoming
2
Almería (Province)
1
Arikaree Formation
1
Astoria
1
Atlantic Coast (U.S.)
1
Atlantic County
1
Bikini Atoll (Marshall Islands)
1
Black Canyon (Ariz. and Nev.)
1
Bodie Hills
1
Broken Ridge Region
1
California, Southern
1
Calvert County
1
Casmalia Hills Region
1
Cherry County
1
Chesapeake Group
1
Coos Bay
1
Enewetak Atoll (Marshall Islands)
1
Esmeralda County
1
Florida
1
Gila County
1
Goldfield Mining District (Nev.)
1
Goshen County
1
Idaho
1
Kirkwood Formation (N.J. and Pa.)
1
Los Angeles Basin
1
Maryland
1
more ...