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Region
- Michigan3
- Hoodoo Quartzite (Idaho)2
- MontanaGlacier National Park2
- Yellowjacket Formation (Idaho)2
- ArizonaGila County1
- ColoradoCuster County1
- Glacier National Park (Mont.)1
- IdahoHoodoo Creek (Lemhi County) Region1
- IdahoHoodoo Creek Region1
- Montana1
- Snowslip Formation (Mont.)1
- South Dakota1
- Upper Peninsula (Mich.)1