Region
Morrison Formation
33
New Mexico
12
San Juan Basin (N.M. and Colo.)
9
Colorado
7
Utah
3
West (U.S.)
3
Colorado Plateau
2
Wanakah Formation
2
Ambrosia Lake (Lake)
1
Apache County
1
Arizona
1
Garfield County
1
Grants Region
1
McKinley County
1
Navajo Indian Reservation
1
Powder River Watershed (Wyo. and Mont.)
1
San Juan County
1
San Miguel County
1
Southwestern States
1
Ute Mountain Indian Reservation
1