Region
Idaho
Montana
7
Valley County
6
Cassia County
4
Blaine County
3
Bonneville County
3
Camas County
2
Lemhi County
2
Shoshone County
2
Utah
2
Arizona
1
Beaverhead County
1
Boise County
1
Box Elder County
1
California
1
Elko County
1
Elmore County
1
Idaho County
1
Mineral Hill region
1
Montpelier Area
1
Nevada
1
Phosphoria Formation
1
Salmon Region
1
Stanley Region
1
Wyoming
1