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Region
- Colorado25
- Utah18
- Wyoming18
- Puerto Rico14
- New Mexico13
- San Juan Basin (N.M. and Colo.)12
- Uinta Basin (Utah and Colo.)12
- United States11
- Alaska9
- Montana9
- Frontier Formation8
- Georgia8
- Mesaverde Group8
- Powder River Basin (Wyo. and Mont.)8
- Alabama7
- Black Hills (S.D. and Wyo.)7
- ColoradoPiceance Creek Basin7
- Gulf Coast (U.S.)7
- Pierre Shale7
- Texas7