In contrast to the thin-bedded siltstone and shale of the Bedford Formation, the Berea Sandstone consists of thick, massive beds of sandstone. The cement that holds the grains of sand together varies from bed to bed. Strongly cemented layers tend to resist chemical and mechanical weathering. They form high cliffs and vertical walls along the creek. The weakly cemented layers erode more rapidly, and tend to form recesses under the overhanging cliffs, as shown above.
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