Region
Colorado
8
Utah
8
Montana
4
Morrison Formation
3
Wyoming
3
Arizona
2
Powder River Watershed (Wyo. and Mont.)
2
San Juan Basin (N.M. and Colo.)
2
Black Canyon of the Gunnison National Park Region
1
Dolores County
1
Montezuma County
1
Montrose County
1
New Mexico
1
Northern Hemisphere
1
Ouray Region
1
San Juan County
1
San Miguel County
1
Uravan Region
1
Wanakah Formation
1