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Spatial Coverage
- Powder River Basin (Wyo. and Mont.)26
- Nevada11
- Maryland9
- Denver Basin7
- New York (State)4
- California2
- Cattaraugus County2
- Mesaverde Group2
- Nye County2
- Québec (Province)2
- Alabama1
- Alaska1
- Arizona1
- Beechey Point Region1
- Bigstone Lake Region1
- Cantin Lake Region1
- Colorado1
- Colorado River Watershed (Colo.-Mexico)1
- Delaware1
- Florida1
