WELLS OF JEFFERSON COUNTY, ILLINOIS. 

 Log of deep boring at St. Johns, Illinois — Continued. 



773 



Sandy shale. 



Lime rock 



Sand rock... 



Shale' 



Sand rock... 

 Lime rock... 

 Sand rock... 

 Clay shale . . 

 Sandy shale. 

 Mixed shale . 



Lime rock 



Shale 



Lime rock . . . 

 Clay shale . . 



Lime rock 



Sandy shale . 

 Clay shale . . 

 Sandy shale . 

 Lime rock... 

 Sand rock . . . 



Lime rock 



Sandy shale . 

 Sand rock... 

 Sandy shale . 

 Lime rock .. . 



Red marl 



Sand rock... 

 Sandy shale . 

 Sand rock... 

 Soft shale . . . 



Sand rock 



Blue lime 



Sand rock 



Depth 



Feet. 



578- 610 



610- 018 



618- 643 



643- 656 



656- 666 



666- 669 



669- 679 



679- 709 



709- 744 



744- 779 



779- 795 



795- 815 



815- 840 



840- 855 



855- 860 



860- 875 



875- 915 



915- 982 



982-1, 002 



1, 002-1, 022 



1, 022-1, 032 



1, 032-1, 054 



1, 054-1, 067 



1, 067-1, 087 



1, 087-1, 107 



1, 107-1, 111 



1, 111-1, 150 



1. 150-1, 190 



1, 190-1, 280 



1, 280-1, 290 



1, 290-1, 300 



1, 300-1, 305 



1, 305-1, 310 



Shale 



Sand rock. 

 Shale 



Red marl 



Shale 



Lime rock 



Shale 



Sand rock : 



Lime rock 



Sand rock 



Lime rock 



Shale with partings 



Lime rock 



Shale 



Sand rock 



Shale, mixed 



Lime rock 



Sandy shale 



Lime rock 



Shale 



Lime rock, 38 per cent salt.. 



Shale 



Lime rock, 38 per cent salt.. 



Fire clay or shale 



Lime rock with partings 



Shale 



Lime rock with partings 



Sandy lime rock 



Light gray lime rock 



Spar, caleite crystals 



Light gray lime rock, hard . . 

 Light gray lime rock, soft .. 

 Mainly limestone to 3,600 feet 



F.n. 



10 



10 



14 



4 



4 



16 



7 



14 



10 



15 



6 



20 



35 



23 



20 



19 



4 



8 



40 



15 



92 



3 



250 



20 



57 



10 



102 



160 



63 



4 



498 



227 



600 



Depth. 



Feet. 

 1, 310-1, 320 



1, 320-1 

 1, 330-1 

 1, 344-1 

 1, 348-1 

 1. 352-1 

 1, 368-1 

 1, 375-1 

 1, 389-1 

 1, 399-1 

 1, 414-1 

 1, 420-1 

 1, 440-1, 

 1, 475-1 

 1, 498-1 

 1, 518-1 

 1, 537-1 

 1,541-1 

 1, 549-1 

 1, 589-1 

 1, 604-1 

 1, 696-1 

 1, 699-1 

 -1, 949-1 



1, 969-2. 



2, 026-2. 

 2, 036-2, 

 2, 148-2 ; 

 2, 208-2 

 2, 271-2 

 2, 275-2 



2, 773-3. 



3, 000-: 



330 

 344 

 348 

 352 



399 

 414 

 420 

 440 

 475 

 498 

 518 

 537 

 541 

 549 

 589 

 604 

 696 

 699 

 949 

 969 

 026 

 036 

 148 

 208 

 271 

 275 

 773 

 000 

 600 



Altitude of well mouth, 463 feet above tide. 



JEFFERSON COUNTY. 

 GENERAL STATEMENT. 



Jefferson County is situated east of Washington and Perry counties, 

 about midway between the Mississippi and Wabash rivers, with Mount 

 Vernon as the county seat, and has an area of 580 square miles. The 



