Region
Texas
14
Germany (West)
9
United States
6
Deaf Smith County
5
Palo Duro Basin
5
Louisiana
4
Paradox Basin
3
Utah
3
Avery Island
2
Avery Island (La.)
2
Permian Basin (Tex. and N.M.)
2
Richton Dome (Miss.)
2
Swisher County
2
Abajo Mountains
1
Alabama
1
Cyprus
1
Davis Canyon
1
Greece
1
Gulf States
1
Melvin
1
New Mexico
1
Ohio
1
Palo Duro Basin (Tex.)
1
Vacherie Dome (La.)
1