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Spatial Coverage
- Powder River Basin (Wyo. and Mont.)26
- California6
- San Bernardino County5
- Mesaverde Group2
- Alaska1
- Arizona1
- Blue Ridge Mountains Region1
- Columbia River Watershed1
- Columbia River Watershed.1
- Essex County1
- Kansas1
- Massachusetts1
- Missouri1
- Nevada1
- Niobrara Formation1
- Peru1
- South Carolina1
- United States1
- United States, West.1
- Virginia1
