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Region
- Montana15
- Powder River Basin (Wyo. and Mont.)5
- Wind River Basin (Wyo.)5
- WyomingWind River Basin5
- Judith River Formation3
- Lakota Formation3
- Bighorn Basin (Mont. and Wyo.)2
- Colorado2
- MontanaPioneer Mountains2
- Uinta Basin (Utah and Colo.)2
- Blackleaf Formation (Mont.)1
- Fort Union Formation1
- Lance Formation (Colo. and Wyo.)1
- MontanaBeaverhead County1
- MontanaBroadwater County1
- MontanaMeagher County1
- New Mexico1
- Northwestern States1
- South CarolinaCharleston Region1
- Utah1