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