Region
Wyoming
43
Sweetwater County
18
Green River Formation
13
Colorado
12
Wasatch Formation
8
Green River Watershed (Wyo.-Utah)
7
Garfield County
4
Moffat County
4
Rock Springs Region
3
Mesaverde Group
2
Rio Blanco County
2
Alaska
1
Almond Formation
1
Almond Formation (Wyo.)
1
Blair Formation (Wyo.)
1
Fox Hills Formation
1
National Petroleum Reserve
1
Rock Springs Formation (Wyo.)
1
Rocky Mountains
1
Sand Wash Basin (Colo. and Wyo.)
1
Washakie Watershed
1