213 



fooii Creek has cut a ravine in the ^lanstield ^^anllstlllu' l)luff and oriu'laally 

 fell over a ledge about six feet liiirli. A joint jilain 20 feet back from the 

 brink of the fall permitted tlie stream to descend and work its way under 

 the stratum. The result is a natural l)ridge (10 feet long, 20 feet wide, 2 

 feet thick in tlu^ ndddli'. with a span uf .'iO feet and a clear height of 

 feet nndei-neath. ( I'Mu. IT), i 



Figure 15. Natural Bridge, Mansfield, Ind. 



