Comments on Geologic Parameters

04 Net Sand Thickness:

The net sandstone thickness of the Fox Hills Sandstone is calculated from formation isopach and percent-sand data from Lewis and Hotchkiss (1981). Percent sand values of the Fox Hills Sandstone are more than 70 percent in Montana and decrease to 40 to 50 percent in the south part of the basin.

04 Map:

04 Reference:

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.