Region
Colorado
53
United States
13
Utah
10
Wyoming
9
Piceance Creek Basin
7
Green River Formation
5
Piceance Creek Watershed
5
West (U.S.)
4
Garfield County
2
Kentucky
2
Louisiana
2
Montana
2
Texas
2
Alabama
1
Anderson County
1
Appalachian Basin
1
Austin County
1
Beaverhead
1
Beaverhead County
1
Brazil
1
California
1
Creek County
1
Cuyahoga County
1
Denver Basin
1
Estill County
1
Europe
1
Green River (Wyo.-Utah)
1
Green River Watershed
1
Green River Watershed (Wyo.-Utah)
1
Gulf Coast
1
Illinois Basin
1
Michigan Basin (Mich. and Ont.)
1
Ohio
1
Oklahoma
1
Piceance Creek
1
Piceance Creek Watershed (Colo.)
1
Powder River Basin (Wyo. and Mont.)
1
Rock Springs
1
Rulison
1
Spain
1
Uinta Basin (Utah and Colo.)
1
Uintah County
1
Washakie Watershed
1
Washington County
1