512 



THE GEOLOGY OP MINNESOTA. 



[Wells. Water analysis. 



Most of the wells at Jackson find an ample supply of excellent water at depths from 20 to 30 

 feet. 



Delafield. M. A. Foss; sec. 18: well, 22 feet; soil, 2; yellow till, 10; much harder blue till, 

 10; water rose six feet in three hours, from a vein of sand three inches thick. 



Heron Lake. M. A. Foss; at Lakefleld, in the S. VV. J- of sec. 33: well, 21 feet; soil, 2 feet, 

 yellow till, picked, 16; quicksand, 3 feet; water is five feet deep. 



Hunter. Railroad well, 68 feet deep; in the N. \V. J of sec. 3, one mile east of Lakeiield : 

 soil, 2 feet; yellow till, about 20; harder blue till, 18; gray quicksand, 4 feet; blue till, 24 feet, and 

 extending deeper; water came in sandy steaks in the last three feet, and rose in three days to be 

 forty feet deep. 



Minneota. William Austin; S. W. J of sec. 25: well, 27 feet; soil, 3; yellow till, spaded, 24; 

 water seeps, filling the well usually to a depth of nine feet. 



Weimer. The deep railroad well at Heron Lake, penetrating to the Potsdam sandstone, has 

 been described on page 503. The common wells of Heron Lake are 10 to 20 feet deep, finding 2 

 to 4 feet of soil, and yellow till, which is spaded, for all below. The water is naturally good, but 

 by the decay of wooden curbing is often made objectionable to both taste and smell. 



Sioux Valley. A. McCulla; sec. 34: well, 36 feet; soil, 3; yellow till, picked, 17; sand and 

 gravel, 4 feet; blue till, much harder than the upper till, 12 feet; water rose ten feet in two days 

 from springs in the blue till. 



La Crosse. E. Nelson; sec. 13: well, 30 feet; soil, 2; yellow till, 11; yellow "hardpan, almost 

 as hard as rock," 17 feet; water rose five feet from sand at the bottom, but the well is sometimes 

 filled to the top with surface-water. 



Eieington. Nelson Jordan; N. W. t of sec. 30: well, 30 feet; soil, 3; yellow till, spaded, 12; 

 darker and harder gray till, picked, 15; water seeps from the lower part of the yellow till, filling 

 the well to a depth of fifteen feet. 



Mound Lake. J. Walker; sec. 14: well, 19 feet; soil, 2; sand, 4 feet; yellow till, spaded, 8 

 feet; blue till, very tenaceous, but not harder than the yellow till, 5 feet; water comes in the lower 

 part of the yellow till, usually standing ten feet deep. 



The drift contains a considerable proportion of the carbonates of lime 

 and magnesia, giving a very productive soil, and making the water of springs 

 and wells hard ; but it supplies no noticeable admixture of the bitter and 

 alkaline ingredients which are found abundantly in the water of some dis- 

 tricts farther west. 



Analysis of the water of Heron lake. 



A sample of the water of Heron lake, collected in June, 1882, was analyzed by Mr. W. A. 

 Noyes. with the following result:* 



Chemical series, No. 128. Composition of residue from evaporation. 



Parts per 

 1,OUO,UOO. 



Silica 7.1 



Alumina and oxide of iron 1.7 



Carbonate of lime 102.7 



Sulphate of lime 47.9 



Nitrate of lime 5.0 



Carbonate of magnesia 76.3 



Carbonate of lithia traces. 



Sulphate of potash 8.0 



Nitrite of potash traces. 



Sulphate of soda 18.5 



Chloride of sodium : 5.1 



Total.. 272.3 



3.0 



6.8 

 1.9 



0.46664 



1.07911 

 0.29748 



100.00 15.88166 



* Eleventh annual report. 



