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Region
- Morrison Formation13
- Colorado11
- New Mexico10
- West (U.S.)9
- San Juan Basin (N.M. and Colo.)6
- Utah6
- Colorado Plateau5
- Alaska4
- United States4
- Montana3
- Powder River Basin (Wyo. and Mont.)3
- AntarcticaPensacola Mountains2
- Arapien Shale (Utah)2
- California2
- ColoradoMontezuma County2
- Culpeper Basin (Va. and Md.)2
- Cutler Formation2
- Great Plains2
- Idaho2
- Mexico2