Region
Wyoming
Montana
19
Utah
18
Colorado
15
Sweetwater County
12
Fremont County
10
Lincoln County
9
Carbon County
8
Johnson County
7
Natrona County
7
Albany County
6
Crook County
6
South Dakota
6
Idaho
5
Weston County
5
Alaska
4
Big Horn County
4
Black Hills (S.D. and Wyo.)
4
Laramie County
4
North America
4
Teton County
4
Uinta County
4
United States
4
Bighorn Mountains (Wyo. and Mont.)
3
California
3
Converse County
3
Park County
3
Pennsylvania
3
Platte County
3
Powder River Basin (Wyo. and Mont.)
3
Rock Springs Region
3
Wind River Basin
3
Arizona
2
Campbell County
2
Granite Mountains
2
Green River Formation
2
Hot Springs County
2
Laramie Basin
2
Mississippi
2
Missouri
2
Moffat County
2
Nebraska
2
Nevada
2
New Mexico
2
Niobrara County
2
Oklahoma
2
Powder River County
2
Rosebud County
2
Seward Peninsula
2
Sheridan Region
2
more ...