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Region
- ArizonaGrand Canyon National Park1
- ArizonaPalisades Creek1
- Black Hills (S.D. and Wyo.)1
- California1
- CaliforniaSan Mateo County1
- East (U.S.)1
- FloridaKey Largo Region1
- Mars (Planet)1
- Mississippi River Valley1
- MissouriNew Madrid Region1
- MontanaAvon Region1
- MontanaBigfork Region1
- NevadaLincoln County1
- NevadaNye County1
- NevadaReno Region1
- NevadaYucca Mountain Region1
- New Hampshire1
- New Madrid Region (Mo.)1
- New Madrid Seismic Zone1
- New York (State)1