Region
United States
7
Alaska
5
Colorado
4
Earth (Planet)
4
Utah
4
California
3
Iron County
3
Kansas
3
Canada
2
India
2
Michigan
2
Amargosa River Valley (Nev. and Calif.)
1
Amchitka Island
1
Antarctica
1
Arizona
1
Cholame Region
1
Colorado Plateau
1
Cook Inlet
1
Copper River Watershed
1
Custer County
1
Eagle County
1
England
1
Fort Huachuca
1
Great Britain
1
Idaho
1
Indiana
1
Juab County
1
Leadville Region
1
Linn County
1
Maine, Gulf of
1
Mineral County
1
Mono County
1
Nebraska
1
Nevada
1
North Macedonia
1
Oregon
1
Owens Valley
1
Pensacola Mountains (Antarctica)
1
Powder River Basin (Wyo. and Mont.)
1
San Andreas Fault (Calif.)
1
San Francisco Mountains
1
Seward Peninsula
1
Seward Peninsula (Alaska)
1
Sierra Vista
1
Soda Springs Region
1
Uncompahgre Plateau
1
Uncompahgre Plateau (Colo.)
1
Washington (State)
1
Wisconsin
1
Yakima River Watershed
1