Region
Kentucky
17
Idaho
6
Nevada
5
Pennsylvania
4
Maine
3
Middle West
3
West (U.S.)
3
Anadarko Basin
2
Appalachian Basin
2
California
2
China
2
Custer County
2
New England
2
North America
2
Nye County
2
Tennessee
2
Wisconsin
2
Alaska
1
Argentina
1
Arizona
1
Arkansas
1
Blaine County
1
Blount County (Tenn.)
1
Bristol Region
1
Bucks County
1
Chattanooga Region
1
Connecticut
1
De Pere
1
Grady County
1
Great Basin
1
Great Smoky Mountains (N.C. and Tenn.)
1
Illinois
1
Indiana
1
Iowa
1
Kansas
1
Lemhi Range
1
Lemhi Range (Idaho)
1
Malaysia
1
Maysville
1
Mendoza (Province)
1
Middle Atlantic States
1
Monroe County (Tenn.)
1
New Jersey
1
New Mexico
1
New York (State)
1
Newton County
1
Ohio
1
Oklahoma
1
Paxton Group
1
Pioneer Mountains
1
more ...