152 GEOLOGY OF EASTERN WISCONSIN. 



in thickness, is the lowest member of the drift at this point, and 

 seems to consist of partially cemented sand and gravel. The first flow 

 of water is usually accompanied by a green or brown sand. The 

 flow of the third class originates in the rock, within from six to 

 twenty feet of its surface, and is unaccompanied, in general, by sand 

 of any kind. The vast majority of the wells of the city belong to one 

 of these three classes. The generous well of Mr. George Hunter, 

 known as "Hunter's Magnetic Saline Fountain," derives its flow 

 from the deeper limestone strata, as is shown from the following sec- 

 tion furnished through the kindness of the proprietor: 



Feet. 



Red clay 26 



Blue clay, bowlders and concrete 30 



First water course at 56 



Brown limestone 14 



Second watercourse at 70 



Brown limestone 40 



Third watercourse at 110 



White limestone 30 



Fourth water course at 140 



Crystalline cherty limestone 20 



Cherty limestone 27 



Fifth water course at 187 



Total depth 187 



The following is an analysis of the rock taken from this well, made 

 by Rev. A. C. Barry: 



Lime 28.90 



Magnesia 20.76 



Protoxide of iron 2. 19 



Soda 20 



Chlorine trace . 



Sulphuric acid 10 



Carbonic acid 45 . 51 



97.66 



From which it appears that this rock, in common with nearly all 

 so-called limestone of eastern Wisconsin, is really a doloniite. The 

 following is the analysis of the water of this well, published by the 

 proprietor. As the form is somewhat unusual, the letter communi- 

 cating it is published: 



KEOKUK MEDICAL COLLEGE, February 9, 1874. 

 GEOBGK HUNTER, ESQ. : 



Dear Sir: I have, to-day, completed the quantitative analysis of your mineral water, 

 and with the following results. Out of one gallon of water I obtained 19 grains as 

 residuum. 



