Old Man's Cave, footbridge, in Hocking Hills State Park, near Logan, Ohio, USA. The park contains numerous gorges, waterfalls, overhangs, and cliffs worn out of the picturesque Black Hand Sandstone, colored from orange to tan. The Black Hand Sandstone Member of the Cuyahoga Formation was deposited early in the Mississippian Period (359-318 million years ago). It underlies the Hocking Hills like a sandwich, with a hard top and bottom and a soft middle layer. Its geologic formation involved the ancient Appalachian Mountains to the east feeding rivers which deposited sand and gravel, which later become a coarse, sometimes conglomeratic quartz sandstone.
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