The Knobstone Escarpment: Scenic Hoosier Landform (GM-18)
The most prominent topographic landform is a rocky ridge in southeastern Indiana called the Knobstone Escarpment. This bold ridge, towering hundreds of feet above the Scottsburg Lowland to the east, extends from southern Johnson County 150 miles southward across the Ohio River into Kentucky. These scenic hills mark the easternmost extension of rocks forming the rugged country of the Norman Upland to the west. The Hills of Brown County are a well-known example of Norman Upland topography.

The Knobstone Escarpment is composed of resistant siltstones of the upper part of Borden Group rocks. Older and more easily eroded shales to the east form the Scottsburg Lowland; a thick section of soluble limestones form the low, undulating Mitchell Plain west of the Norman Upland.

Our Hoosier State Beneath Us: Geomorphology