42 



The Water Lime and Lower Helderberg are two closely related lime- 

 stones of the Upper Silurian age which, in Indiana, so merge as to be 

 ditlicnlt to distinguish. They represent an epoch lietweeu that of the 

 Niagara limestone and tlie lowest or oldest rocks of tlic Devonian era. 



Uqend. 



Hudson Rivte 

 Limestants and 

 ShaUs ■ 



Lirvtt ttrUrtbtn 

 iwi !(^aJTT-ttin< SSI 



Their texture and composition shows them to have been laid down in very 

 shallow seas close into the shores of the recently upraised Niagara lime- 

 stone. The Water Lime is an impure magnesian hydraulic rock, ranging 

 in thickness in Indiana from 20 to 90 feet. It outcrops near Kokomo 



