Region
Wyoming
Sweetwater County
18
Green River Formation
9
Colorado
6
Wasatch Formation
6
Rock Springs Region
3
Moffat County
2
Almond Formation
1
Almond Formation (Wyo.)
1
Blair Formation (Wyo.)
1
Fox Hills Formation
1
Green River Watershed (Wyo.-Utah)
1
Mesaverde Group
1
Rock Springs Formation (Wyo.)
1
Washakie Watershed
1