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Region
- Montana19
- Appalachian Basin11
- Powder River Basin (Wyo. and Mont.)9
- Michigan7
- Middle West6
- Uinta Basin (Utah and Colo.)6
- Colorado5
- PakistanBalochistān Region5
- Wind River Basin (Wyo.)5
- WyomingWind River Basin5
- California4
- Illinois Basin4
- Mississippi4
- Missouri4
- Ontario4
- ArkansasHarrison Region3
- Fort Union Formation3
- Judith River Formation3
- Kansas3
- Lakota Formation3