42 



The Water Lime and Lo\Aer Helderberg are two closely related lime- 

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

 difficult to distinguish. Ihey I'epresent an epoch between that of the 

 Niagara limestone and the lowest or oldest rocks of the Devonian era. 



Legend. 



Hudson Rivee 

 Limesttnts oni 

 ShaXts ■ 



4H(t ttT«J^^ne d 

 <Miit VoJn-ljsn B3 







il th( Clou a\ 



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 



