1846.] .Agricultural Geology of Onondaga County. 



189 



numerous springs flow out, some of which are mill streams of 

 considerable value. The waters which flow from this plane are 

 hard waters, but are still palatable. Those however which pene- 

 trate into the green shales and flow from them, are still more 

 hard; and, as has been already stated, dissolve from the rock 

 sufficient crenic acid to impart to them a bitter taste. 



In the deeper excavations which have been filled or partially 

 filled with drift, many of the brine springs are found and procured 

 by boring. In illustration of this view we subjoin an ideal sec- 

 tion of Onondaga lake and the subjacent formations. 



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