Comments on Geologic Parameters

01 Depth:

The principal source for mapping formation depth of the Fox Hills Sandstone in the Powder River Basin is Lewis and Hotchkiss (1981), who presented a structure map on the top of the Fox Hills Sandstone; it reaches a maximum depth of more than 3,000 ft (>910 m) in the steeply dipping, western part of the basin, west of Gillette. We subtracted the subsea elevation of the formation top from the gridded land-surface elevation from a DEM generated from Digital Terrain Elevation Data (National Imagery and Mapping Agency, 2000) to calculate depth to top Fox Hills.

01 Map:

01 Reference:

Fox, J., and Higley, D., 1987, Structural at the Base of the Upper Cretaceous Fox Hills Sandstone, Power River Basin, Wyoming and Montana. USGS OFR 8

Lewis, B. D., and Hotchkiss, W. R., 1981, Thickness, percent sand, and configuration of shallow hydrogeologic units in the Powder River Basin, Montana and Wyoming: U. S. Geological Survey, Miscellaneous Investigations Series, Map I-1317, 6 sheets.

National Imagery and Mapping Agency, 2000, Digital terrain elevation data (DTED Level 0).