Region
Utah
Colorado
54
Wyoming
25
San Juan County
20
Nevada
15
Arizona
13
Green River Formation
11
Idaho
9
Juab County
9
Paradox Formation
9
Carbon County
8
Grand County
8
New Mexico
8
Garfield County
7
Kane County
7
Wasatch Range (Utah and Idaho)
7
Emery County
6
Great Salt Lake
6
Iron County
6
Jordan River
6
Oquirrh Mountains
6
Duchesne County
5
Tooele County
5
Uintah County
5
California
4
Great Basin
4
La Sal Mountains
4
Marysvale
4
Navajo Indian Reservation
4
Navajo Sandstone
4
Paradox Basin
4
Salt Lake County
4
Uinta Basin (Utah and Colo.)
4
Utah County
4
West (U.S.)
4
Beaver County
3
Bonneville, Lake
3
Canyonlands National Park
3
Chinle Formation
3
Colorado River Watershed (Colo.-Mexico)
3
Daggett County
3
Hopi Indian Reservation
3
Jordan River (Utah)
3
La Sal Mountains (Utah)
3
Phosphoria Formation
3
Piceance Creek Basin
3
Uinta Mountains (Utah and Wyo.)
3
Washington County
3
Wayne County
3
Book Cliffs (Utah and Colo.)
2
more ...