Artesian Well Boring in Southeastern Minnesota — Hall. 139 



III. The West Hotel Well— C. W. Hall. 



[Compare this Bulletin, p. 122. Tlie sligiit discrepancies whicli may be noted arise 

 from the fact that the former summary was made up from Mr. Swan's written notes, 

 while tnis synopsis is compiled from a series of drillings preserved for the writer by Mr. 

 Swan at the time the well was sunk. N. H. Winche'l received a series of drillings.]* 



Formation 1. Consisting of ordinary drift material, from 835 feet above 

 the sea, downwards to a depth of 18 feet. 

 2 and 3. Not represented. 



4. Limestone and shale 20 feet. 



5. White and yellow sand 164 feet. At 164 feet from the surface a 

 layer of red shale four feet in thickness was penetrated. The first flow of 

 water came from beneath this shale. The supply was not sufficient. 



6. Dolomitic limestone 82 feet thick. At the top the color is reddish 

 and the rock contains many grains of sand. (This Bulletin, p. 123.) Below 

 a yellowish drab color prevails. 



7. Below the preceding, a layer 15 feet in thickness occurs, which is 

 referred to Upham's Elevator B sandstone. The drillings seem to contain 

 about 30 per cent, of dolomite chips. 



8. Thirty-six feet of dolomite, or dolomitic limestone underlies the 

 jireceding. 



9. A l)ed of sandstone 96 feet in thickness yielded the second flow of 

 water. This rock varies from fine to coarse in texture, the coarser lying 

 near the bottom. 



10. A thickness of 161 feet is grouped as this number of the series. 

 The first 45 feet in descending order, is a fine white sand with some light 

 gray calcareous material intermingled. It is quite near No. 9 in general 

 characters, and it is not certain but it should be grouped with the sands of 

 that formation rather than with the shales of this. The following 116 feet 

 consists of green shales quite hard and firm at the bottom. 



11. The clear white sand of this formation "at the top of the Saint 

 ("roix," was penetrated 30 feet. A supply of water running 300 gallons per 

 minute was struck, when boring ceased. 



Total depth of this well 622 feet. 



IV. The East Minneapolis Well**— i^7*<wi Warren Upham's Notes. 



Formation 1. First 42 feet "sand and till" from 850 above the sea down- 

 wards. 



2 and 3. Not present in this vicinity. • 



4. From 42 to 70 feet; 28 feet in thickness. 



5. To 234 feet, clear white sand; 164 feet thick. 



6. To 352 feet; first 102 feet red limestone, then 16 feet of gray lime- 



^t and 8. Not distinguished in this well from No. 6. No. 8 may lie 

 however, in the "gray limestone" of the lower portion. 



9. In this well is 116 feet thick; from 352 feet to 468 feet. The sand 

 is white and clean. 



♦Fourteenth An. Rep. Geol. and Nat. Hist. Sur. Minn , p. 11. 

 **Compare N. H. Winchell, these Bulletins, vol. i, p. 187. 



