Region
Utah
8
West (U.S.)
7
Colorado
4
Florida
4
Idaho
4
Nevada
3
Arizona
2
Montana
2
New Mexico
2
Nye County
2
Oklahoma
2
United States
2
Alaska
1
Baja California (Peninsula)
1
Bone Valley (Fla.)
1
Broadwater County
1
California
1
Central Valley
1
Coast Ranges
1
Colorado Plateau
1
Eddy County
1
Emery County
1
Fall River County
1
Gulf States
1
Jefferson County
1
Kansas
1
Mexico
1
Michigan
1
Minnesota
1
Missouri
1
Monument Valley (Ariz. and Utah)
1
Nevada National Security Site (Nev.)
1
New Hampshire
1
Pacific Coast (North America)
1
Paradox Basin
1
Saguache County
1
San Juan Basin Region (N.M. and Colo.)
1
San Miguel County
1
South Dakota
1
Southwest, New
1
Sweden
1
Tennessee River Valley
1
Texas
1
Wisconsin
1
Wyoming
1