Region
Colorado
67
Utah
41
Grand County
4
Park County
4
Rocky Mountains
4
Wasatch Fault Zone (Utah and Idaho)
4
Douglas County
3
El Paso County
3
Fremont County
3
Gunnison County
3
Iron County
3
Kane County
3
Moffat County
3
San Juan County
3
Sanpete County
3
United States
3
Washington County
3
Box Elder County
2
Cedar Valley (Iron County)
2
Chaffee County
2
Delta County
2
Elbert County
2
Garfield County
2
La Plata County
2
Lake County
2
Paradox Basin
2
Pueblo County
2
Rio Blanco County
2
Rocky Mountains Region
2
Routt County
2
Saguache County
2
Sevier County
2
Uinta Basin (Utah and Colo.)
2
Adams County
1
Alamosa County
1
Arapahoe County
1
Arches National Park (Utah)
1
Archuleta County
1
Arkansas River Valley
1
Baca County
1
Bakken Formation
1
Bear River Valley (Utah-Idaho)
1
Bent County
1
Boulder County
1
Cache County
1
Cache Valley (Utah and Idaho)
1
California
1
Castle Valley
1
Cedar Valley (Utah County)
1
Cheyenne County
1
more ...