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the water, or a little above the top of the entrance of the 
main cave, the roof is seen to change. It is above the lime- 
stone, and the naked sandstone stretches from side to side. 
A little further on “the Maelstrom” is reached, another 
huge pothole, in which the gravels at the bottom are but 
little above the present water-level, while the dome reaches 
far up into the sandstone. 
On the return journey, a short cut is made up what is 
called “ the Corkscrew.” In reality it is a scramble up a 
cleft in the rocks nearly choked by debris, the top of which 
is also very near the sandstone. To give an idea of the 
vastness of this underground drainage I copy from the 
Guide Book a few dimensions relating to this one cave, and 
be it remembered that the whole country from Bowling 
Green to Mufordsville is similarly honeycombed. 
The chamber called “Wright’s Botunda” is 400 feet one 
way and 100 feet wide, while its height is 40 feet. 
Mammoth Dome, of a similar length, has a roof of 150 
feet span, in the sandstone, and its depth from the bottom 
of the superincumbent sandstone to the floor is 250 feet. 
