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Region
- TexasBrown County4
- TexasColeman County4
- Kentucky3
- Minturn Formation (Colo.)3
- ArizonaGrand Canyon Region2
- Brown County (Tex.)2
- Coleman County (Tex.)2
- Colorado2
- ColoradoEagle County2
- Eagle Valley Formation (Colo.)2
- Kansas2
- New MexicoManzano Mountains2
- UtahEast Tintic Mountains2
- ArizonaGrand Canyon1
- Belden Formation (Colo.)1
- Maroon Formation (Colo.)1
- New Mexico1
- San Juan Basin Region (N.M. and Colo.)1
- United States1
- UtahOquirrh Mountains1