Region
Montana
22
Wyoming
18
Colorado
14
Utah
8
Wind River Basin (Wyo.)
7
Powder River Basin (Wyo. and Mont.)
6
Wind River Basin
6
Emery County
4
Uinta Basin (Utah and Colo.)
4
Carbon County
3
Judith River Formation
3
Lakota Formation
3
Bighorn Basin (Mont. and Wyo.)
2
Blackleaf Formation (Mont.)
2
Fremont County
2
Pioneer Mountains
2
San Juan Basin (N.M. and Colo.)
2
Sanpete County
2
Wasatch Plateau (Utah)
2
West (U.S.)
2
Alberta
1
Arizona
1
Broadwater County
1
Charleston Region
1
Denver Basin
1
Frontier Formation
1
Grand County
1
Great Plains
1
Kansas
1
La Plata County
1
La Plata County (Colo.)
1
Meagher County
1
Mesaverde Group
1
Mexico, Gulf of
1
New Mexico
1
North Dakota
1
Piceance Creek Basin
1
Powder River Watershed (Wyo. and Mont.)
1
San Juan County
1
Saskatchewan
1
South Carolina
1
South Dakota
1
Teton County
1
Texas
1
Uintah County
1