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.
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: