250 



Procccdinr/s of Indiana Academy of Science. 



area. Subterranean piracy is dependent upon differential work of tlie 

 surface streams in tlieir downward cutting. Tliose stream basins or portions 

 of stream basins wliich are relatively high above neighboring stream basins 

 in limestone regions are subject to diversion by subterranean piracy. The 

 most notable case yet described is that described by Beede in his paper 

 on the "Cycle of Subterranean Drainage, as Illustrated in the Bloomington, 

 Indiana, Quadrangle." published in the Proceedings of the Indiana Acad- 

 emy of Science, 1910. In this case several s(iuare miles of the upi>er por- 



OUTLINE MAP OF 

 MONROE AND LAWRENCE 

 COUNTIES INDIANA 

 SHOWINC LOCATION 0F\ 

 DETAIL AAAP OF TH£ 

 CUT-OFF PLANATION 

 PIRACY 



tion of Indian Creek drainage basin have been diverted by subterranean 

 piracy into the more deeply intrenched streams on either side of the head- 

 waters of Indian Creek. 



The third type of stream piracy is the type with which the present 

 paper deals. It is commonly found where a larger stream has reached the 

 stage of maturity in an area of considerable relief. By the lateral planation 

 of the mature main stream a nearly parallel minor stream may be literally 

 cut into two streams, each entering the master stream independently. The 

 upijer part of the once continuous stream will enter the main stream at the 

 place where the master stream invaded the valley of the minor stream. 

 The lower part of the minor stream will be left in a valley far too large 



