Region
Texas
136
New Mexico
7
Oklahoma
6
Gulf Region
5
Brazos River Valley
4
Brown County
4
Coleman County
4
Kansas
3
Louisiana
3
Scurry County
3
Atlantic Coast (U.S.)
2
Dockum Group
2
Guadalupe Mountains National Park
2
Guadalupe Mountains National Park (Tex.)
2
Gulf Coast
2
Gulf Coast (U.S.)
2
Kent County
2
Mexico
2
Minnesota
2
Permian Basin (Tex. and N.M.)
2
Texas Panhandle
2
United States
2
Alabama
1
Alaska
1
Arizona
1
Ascutney Mountain (Vt.)
1
Bexar County
1
Brown County (Tex.)
1
California
1
Chinati Mountains
1
Coleman County (Tex.)
1
Comanche County
1
Culberson County
1
Eagle Mountains region
1
East Texas Basin (Tex.)
1
Elliott County
1
Fremont County
1
Hamilton County
1
Hemphill County
1
Hudspeth County
1
Jeff Davis County
1
Kent County (Tex.)
1
Kentucky
1
Llano County
1
Lubbock Region
1
Marathon Region
1
Medina County
1
Mississippi
1
Mississippi River Valley
1
Missouri
1
more ...