Region
Texas
6
Arkansas
5
Oklahoma
5
Wyoming
4
Alaska
3
Utah
3
Alabama
1
Amsden Formation (Wyo.)
1
Antarctica
1
Arizona
1
Black Warrior River (Ala.)
1
Brooks Range
1
California
1
Canada
1
Europe
1
Grand Canyon Region
1
Grundy County
1
Idaho
1
Illinois
1
Kansas
1
Kentucky
1
Massachusetts
1
Mississippi
1
Missouri
1
Montana
1
Mora County
1
Nevada
1
New Mexico
1
North America
1
Prince of Wales Island
1
Rhode Island
1
Rocky Mountains
1
Sadlerochit Mountains
1
San Saba County
1
Scurry County
1
Southern States
1
United States
1
Wales, South
1
West (U.S.)
1
Wichita Mountains Wildlife Refuge
1
Will County
1