Region
Colorado
16
New Mexico
14
San Juan County
14
Utah
11
Arizona
4
McKinley County
4
Morrison Formation
4
Green River Formation
3
Garfield County
2
Hopi Indian Reservation
2
Navajo Indian Reservation
2
Piceance Creek Basin
2
Piceance Creek Watershed
2
Rio Blanco County
2
Southwest, New
2
Wanakah Formation
2
West (U.S.)
2
Black Canyon of the Gunnison National Park Region
1
Chaco Culture National Historical Park (N.M.)
1
Montrose County
1
Ouray Region
1
San Miguel County
1