IOWA ACADEMY OF SCIENCES. 



Hard blue limestone 



Sandstone 



Sandy limestone 



Limestone 



Black limestone 



Possiliferous limestone with iron pyrites. 



White sandstone 



Brown limestone* 



Grey limestone 



White limestone 



Fine brown sandy limestone 



Hard grey limestone 



Brown sandy limestone 



Hard grey limestone 



Brown sandstone 



Ijimestoue 



Magnesian limestone 



Grey limestone 



Magnesian limestone 



Grey limestone 



Brown sandy limestone , 



Brown sandy limestone 



Fine sandstone 



Grey limestone 



Sandstone 



Magnesian limestone 



Magnesian limestone 



Mottled shale 



Blue slate 



Sandy shale 



Limestone 



Grey limestone 



Grey sandstone 



Grey sandstone •. 



Grey sandstone 



Slate 



Sandy limestone , 



Black sand 



White sand, shells and slate 



Sandy limestone 



White sand, shells, and slate 



Soapstone 



Brown sandstone 



White sand, shells and slate 



Brown sandstone 



Light brown sandstone 



White sandstone 



Grey sandstone 



Dark brown sandstone 



Brown sandstone [flinty] 



Dark brown sandstone 



White sandstone [water 40 feet from surface] 



White sandstone 



Brown sandstone 



Light brown sandstone 



Brown sandstone [quartzite?] 



White sandstone 



Light brown sandstone 



Brown sandstone [quartz crystals] 



Grey sandstone 



Grey sandstone 



Dark grey sandstt>ne 



Coarse, hard, reddish sandstone 



Brown sandstone 



Blue limestone [18.53 bottom of water-bearing rock] 



Grey sandstone 



White sandstone 



Light brown sandstone 



Fine white sandstone 



Light brown sandstone 



White sandstone 



1,1.50 

 1,160 

 1,180 

 1,185 

 1,195 

 1,200 

 1,205 

 1,235 

 1,250 

 1,275 

 1,280 

 1,300 

 ,345 

 ,350 

 ,355 

 ,366 

 1,370 

 1,380 



1,405 

 ■ 450 

 1,470 

 1,475 

 1,490 

 510 

 1,.560 

 1,565 

 ,600 

 ,634 

 1,644 

 1,6.50 



lOlll.i 

 1,675 

 1,680 



1,691 

 1,697 

 1,709 

 1,715 

 1,720 

 1,725 

 1,727 

 1,733 

 1,738 

 1,744 

 1,7.55 

 1,765 

 1,770 

 1,775 

 1,784 

 1,794 



1,832 

 1,835 

 1,836 

 1,837 

 1,840 

 1,848 

 1,850 

 1,857 

 1,875 

 1,880 



*1,210 ft. struck fresh water, rising to 126 ft. from surface. 



