Natural Arch, Kentucky

April 09, 2006

Natural_arch copy

Provided by: Matt Girdler
Summary authors & editors: Jim Foster; Matt Girdler

The photo above of a natural arch in eastern Kentucky was taken on a hike I took with a church group in late autumn. In the Daniel Boone National Forest, a number of scenic arches can be found, which include ridge-top arches, in relatively soft sandstone and conglomerate, harder sandstone bridges, and even underlying limestone cave arches. Though the rocks forming the arches are in some case over 250 million years old, the arches themselves likely began forming approximately 10,000 years ago. The majority of natural bridges in Kentucky are known as lighthouse arches -- they form at the ridge-top meeting of two valleys. A natural bridge, on the other hand, spans a river or stream.

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