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Muldraugh Hill is an escarpment in central Kentucky separating the Bluegrass on the north and north-east from the Pennyrile on the south and south-west. This escarpment fades into the Pottsville Escarpment on the east, and terminates at the Ohio River in the west, although in truth it continues in Indiana as Floyds Knobs.
In parts of its eastern stretches, Muldraugh Hill is little more than a slight hill, but in some of the western areas, it is represented by extensive areas of knobs. The formation comprises mostly siltstones and shales, with some minor limestones, between the limestones and dolomites of the older Bluegrass and the limestones of the newer Pennyrile. Rock outcrops are minor except where the overlying limestones are exposed in the north end of Fort Knox.