The western section of the Indiana Uplands, this region contains the hilliest terrain in the state caused by the outcropping of sandstone units at the surface.
[1] In some areas erosion cuts through the sandstone layers completely and exposes underlying limestones.
The alternating sandstones, limestones, and shale of the West Baden and Stephensport groups that compose the Crawford Upland are Mississippian in age.
[2] Interstate 64 traverses this section within Perry, Crawford, Harrison, and Floyd Counties.
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