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Region
- Colorado Plateau15
- Chinle Formation12
- Utah6
- Nevada5
- New Jersey5
- Wyoming5
- Colorado4
- Navajo Indian Reservation3
- New Mexico3
- Virginia3
- AlaskaWrangell Mountains2
- ArizonaMohawk Canyon2
- CaliforniaButte County2
- Chugwater Group (Wyo.)2
- ColoradoEagle County2
- ColoradoMoffat County2
- ColoradoPitkin County2
- ConnecticutBristol Region2
- Culpeper Basin (Va. and Md.)2
- Cutler Formation2