The mountain ends in an escarpment that plummets 350 feet to the jumble of rocks below. This is one of the highest sheer drops east of the Mississippi. At the base of the cliff lie huge chunks of conglomerate, many the size of a school bus. As at the Rock Rift Crevices, the softer shale underneath the ridge has eroded away, causing the rock to break under its own weight. On top of Millbrook Mountain, conditions are very dry.
Frequent fires help keep the forest from becoming too shaded.