140 Artesian Well Boriug in Southeastern Minnesota — Hall. 



10. The "blue shale" of the well borer ])elAveen 4G8 and 596 feet in depth 

 IB regarded as Saint Lawrence. 



11. The white sandstone which was next penetrated through 82 feet, 

 represents this number, the Dresbach sandstone, at East Minneapolis. 



12. What is termed the Upper Saint Croix in Mr. Upham's stratigraphy 

 occupies a thickness of 170 feet. It consists chiefly of a blue shale. 



13. Then comes a white sandstone 217 feet in thickness, in the middle 

 of which a layer of sandy marl 12 feet in thickness was detected. 



14. At 1,074 feet a red marl layer 57 feet thick was passed, and a red 

 gandstone was reached. Boring continued in this rock until work ceased. 



Total depth reached, 1,421 feet. 



V. Thp; EiiEVATOK B yV ¥.\ A. ~ Warren Upham. 



Height 855 feet above the sea. 



Formation 1. Represented by 58 feet of modified drift, 



2 and 3. Not present. 



4. The Trenton limestone is 25 feet thick. 



5. As clean white sand this number is 152 feet thick. 



6. Calcareous sandrock 30 feet; buff magnesiau limestone 35 feet; total 

 65 feet. 



7. White medium grained sand 20 feet in thickness. * 



8. Buff magnesian limestone like the lower part of No. 6, 55 feet in 

 thickness. 



0. This formation, a white sand, is 103 feet thick. 



10. The Saint Lawrence as shales and calciferous sandrock is 194 

 feet thick. 



1 1. As white and gray sandstone 66 feet thick. 



12. The gray and green shales of No. 12 were penetrated 100 feet or 

 more and the boring ceased. 



Depth reached 850 feet. 



VI, The Saint Paul Harvester Works V^kjaJ''— Warren Upham. 



Formation 1. As stratified gravel and sand from 871 feet, downward 

 235 feet. 



2, 3, 4 and 5. All wanting. 



6. "Buff magnesian limestone and sandrock 125 feet." 



7. A sandstone layer 10 feet thick. 



8. "Light yellowish buff magnesian limestone 10 feet." 



9. A gray sandstone 100 feet. 



10. Shales calciferous sandrock and dolomitic limestones down to the 

 bottom of the well, 191 feet. 



Total depth of the well 8713^^ feet. Tw^o wells have been drilled by the 

 Harvester Works company. The first part of each, between 500 and 600 

 feet, was drilled in the ordinary way, but the last part was penetrated by a 

 diamond drill, and a core rather than pulverized drillings was examined. 

 Water stands in both wells at 35 to 40 feet below the surface, and yields a 

 constant supply. 



*Al80 Geol. and Nat. Hist. 8ur. 13th An. Rep., p. 59. 



