IOWA ACADEMY OF SCIENCES. 



63 



Llglit grey sandstone 



Dark grey sandstoue 



Magnesiaii sands one* 



Magnesiau limestone 



Magnesian rock [gypsum?]. 



Light colored sandstone 



Dark grey sandstone 



Light grey sandstone , 



White sandstone 



•Grey sandstone 



Blue sandy limestone 



♦Struck water, rising to 171 feet from surface. 



It is interesting to note that no water was found in this deep well until at a 

 depth 'of 716 feet when salt water was reached in the Carboniferous strata through 

 which the boring was then progressing. Another hundred feet and a second 

 vein of salt water, rising to withing fifteen feet of the surface, was found. Fresh 

 water was not reached in appreciable volume until the drill had penetrated to a 

 depth of 1,235 feet and then the pressure was sufficient only to bring the water to 

 within 126 feet of tbe top. Water, whether salt or fresh is not stated, was found 

 again at 1,794 feet and at 1,836 feet, but neither vein sent water to tbe surface. At 

 a deptb of 1,930 feet the last water-bearing stratum was passed, the drilling ending 

 at 2.000 feet. 



From this section it is clear that the differentiation of strata has been carried 

 far beyond the point to which the geologist would go*. However, it is valuable 

 since it shows clearly the heterogeneous character of the lowermost coal measure 

 strata in Southwestern Iowa. 



This section appears to give corroborative evidence of the general conclusion 

 above indicated, that artesian water would not be found in that portion of tbe 

 State. 



The accompanying map, which appears through the kindness of Hon. J. R. 

 Sage, Director of the Iowa Weather and Crop Service, for whom the facts con- 

 tained in this paper were originally gathered, does not locate all the wells known 

 to us in Iowa. Very many of the wells, especially those which are classed as 

 glacial, occur in groups and are so close together that it is impossible to indicate 

 them on a map of this scale. In a large number of cases, as in Story, Hancock, 

 Hamilton and Iowa counties, each character represents a dozen or more wells. At 

 a future time it is hoped to present all this evidence in the form of a larger map 

 with appropriate mnemonics. 



* I am indebted to the kindness of Mr. Setii Dean, of Glen wood, for the details of the 

 Section. 



