|Fox Hills - Lower Hell Creek, Powder River Basin
The Fox Hills Sandstone typically has water-salinity values under 3,000 ppm (U. S. Geological Survey, 1996). Greatest salinity values occur in the deep, west and southwest parts of the basin.
Henderson, T., 1985, Geochemistry of ground-water in two sandstone aquifer systems in the northern Great Plains in parts of Montana and Wyoming: U. S. Geological Survey, Professional Paper 1402-C, p. C1-C84.
U. S. Geological Survey, 1996, Ground water atlas of the United States: Segment 8: Montana, North Dakota, South Dakota, and Wyoming, p. 117.