164 GEOLOGY OF EASTERN WISCONSIN. 



The following is the section of the well at Milwaukee: 



Drift 170 feet. 



Niagara limestone 267 " 



Cincinnati shale 165 ' 



Trenton and Galena limestones 253 " 



St. Peters sandstone 193 " 



1048 " 



The surface of the well is about ten feet above Lake Michigan. Its 

 flow is strong enough to fill a four-inch pipe at sixty feet above the 

 surface. From the pressure at the surface, it was estimated by the 

 engineer of the company that the water would rise 100 feet above the 

 surface, or 110 feet above the lake, which makes it probable that a 

 similar flow might be obtained at other localities in this region whose 

 altitude does not exceed that. By consulting the table of elevations, 

 it will be seen what territory is included in this limit. 



It will be observed that this flow is from the St. Peters sandstone. 

 By sinking deeper to the Potsdam, a vein capable of rising higher, as 

 at Western Union Junction, would probably be reached. 



The well of Sen. "W. H. Jacobs, in the suburbs of Milwaukee, is 1,200 

 feet deep, and delivers 300 gallons of water per minute. The flow may 

 be carried over 50 feet above the surface. An analysis of the water 

 by Gustavus Bode shows it to have the following composition: 



Grains in 1 gal. U. S. measure. 



Chloride of potassium 0.2745 



Chloride of sodium . . 0.6405 



Sulphate of soda 8.8572 



Sulphate of lime 14.5485 



Bicarbonate of lime 8.6925 



Bicarbonate of magnesia 6.6307 



Bicarbonate of iron 0.1342 



Alumina 0. 1891 



Silica 2.3790 



Total 42.3462 



The city of Sheboygan has recently sunk a public well that pos- 

 sesses unusual interest, both in reference to the strata passed through, 

 and the character of the water obtained. The data for the following 

 section were furnished through the courtesy of Mayor George End: 



Drift 92 feet. 



Niagara limestone 719 ' 



Cincinnati shale .. . 240 ' 



Trenton and Galena limestones. , 213 ' 



St. Peters sandstone , , 212 ." 



Total.. 1475 " 



