IOWA ACADEMY OF SCIENCP:S. 59 



No. Feet. 



6. Coarse, light brown limestone, mixed with shale oQ 



7. Shale 20 



8. Coarse, dark graj' limestone '25 



9. Coarse, light gray limestone 45 



10. Tough blue clay 200 



11. Reddish brown sandstone 295 



12. Shale 5 



13. Dark bliiish-grcy sandstone 65 



14. Shale 1 



15. St. Peter's sandstone 50 



16. Gray sandstone 74 



*17. Brownish sandstone 40 



*1S. Coarse grained porous brown sandstone 270 



19. Light sandstone 88 



20. Dark colored and hard sandstone 42 



21. Brown, very close grained and hard sandstone 140 



22. Blueclay 100 



23. Soft, reddish-brown sandstone 160 



24. Potsda m sandstone 200 



25. Red sandstone 75 



Over the eastern third or more of Iowa, east and north of the line drawn from 

 Keokuk to the vicinity of Sioux City, as above mentioned, thence northeastwardly 

 to Worth or Mitchell counties, the St. Peter's sandstone may be reached in deep 

 wells and flowing water found. North of that part of the line which extends 

 northeastwardly from Sioux City flowing water will not be found, if the indications 

 of the strata penetrated in the Hull, Sioux county, well are reliable. From that 

 place igneous rocks, presenting a volcanic facies, have been submitted to us. 



The southwestern part of the State, that is all that part of Iowa which lies 

 south of the first arbitrary line above indicated, will not furnish artesian waters. 

 The section, which is given elsewhere, of the Glenwood deep boring furnishes the 

 most complete vertical section of the Carboniferous rocks which is exhibited in 

 Iowa. It further affords no hope that artesian waters will be reached at reasonably 

 profitable liepths in that portion of the State. 



The south central parts of Iowa will likewise not, probably, repay drilling for 

 artesian waters. There will, however, doubtless be found very many wells that 

 will furnish abundant water by pumping. These wells will need to go down until 

 the St. Peter's sandstone is reached. If they should stop in the Carboniferous 

 rocks which form the country rock of the region there is little hope that good 

 water will be had. 



♦Contains water. 



