Region
Kentucky
10
Nevada
8
Utah
7
Idaho
5
Pennsylvania
4
North America
3
Southern States
3
Vermont
3
Alaska
2
Anadarko Basin
2
California
2
China
2
East (U.S.)
2
Illinois
2
Iowa
2
Kansas
2
New England
2
Ohio
2
Québec (Province)
2
Simpson Group
2
Tennessee
2
Trenton Group
2
West (U.S.)
2
Wisconsin
2
Appalachian Basin
1
Argentina
1
Baffin Island
1
Bristol Region
1
Bucks County
1
Champlain Valley
1
Connecticut
1
Custer County
1
Georgia
1
Grady County
1
Great Basin
1
Illinois Basin
1
Indiana
1
Lemhi Range
1
Maine
1
Malaysia
1
Maryland
1
Maysville Region
1
Meiklejohn Peak
1
Mendoza (Province)
1
Middle Atlantic States
1
Middle West
1
Millard County
1
New Jersey
1
New Mexico
1
North Dakota
1
more ...