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Camping and woodcraft - Scoutmastercg.com

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CAVE EXPLORATION 345Clinch River, in Virginia, a creek flows through agreat arch for more than half a mile. In MammothCave there is an arcade 4,000 feet long-, 100feet wide, <strong>and</strong> 45 feet high. If both ends of thishall should fall in there would be another of thesenatural tunnels.*teutj#Fig. 189.—Map of a part of the Mammoth Cave(shaded parts are at low level)At first sight it seems incredible that such vastexcavations could be made by chemical action <strong>and</strong>erosion. And yet there have been greater ones informer caverns that kept on hollowing out the rockuntil their roofs could no longer st<strong>and</strong> the strain.

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