| Fox Hills - Lower Hell Creek, Powder River Basin
We were unable to locate maps that show residence time for the Fox Hills Sandstone in the Powder River Basin. However, Henderson (1985) calculated flow rates of 0.16 to 1.08 m/yr from sample data in the northeast part 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.
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