292 GEOLOGY OF ILLINOIS. 



on the railroad a half-mile east of the town, which is located on the 

 prairie a hundred feet above the level of that west of town, in the val- 

 ley of Cahokia creek, a hundred and ten feet of drift clays were passed 

 through before reaching the limestone. At the time of my visit to this 

 locality, in September, 1871, the shaft was down to the horizon of coal 

 No. 6, but no accurate record had been kept at either of these shafts 

 of the character and thickness of the strata passed through. The fol- 

 lowing, given me from recollection by the man in charge of the work in 

 sinking these shafts, is approximately correct. Beginning at the level 

 of the limestone, we have the following : 



Ft. In. 



No. 1. Limestone - 6 



No. 2. Clayshale 35 



No. 3. Fireclay (?) 5 



No. 4. Coal, (No.8) 3 



No. 5. Shales and sandstone, partly arenaceous, and including the horizon of coal No. 7 110 



No. 6. Red shale 4 



No. 7. Limestone 5 



No. 8. Blueshale 3 6 



No. 9. Coal, (No. 6) 2 



No. 10. Clay shale 9 



No. 11. Limestone 17 



No. 12. Bituminous shale '. 2 



No. 13. Coal. (No. 5) 6 



To get the total depth of these shafts we must add ten feet of drift 

 clays to the top of that west of town, and one hundred and ten feet to 

 the top of the other. 



In the vicinity of Bunker Hill there are also two shafts in successful 

 operation, one a half mile south-east of the town, of which Naylor & 

 McPherson are the proprietors ; and the other, owned by Mr. Andrew 

 Howard, one mile and a quarter north of town, on a branch of Wood 

 river. The shaft south-east of town is two hundred and fifty-three feet 

 in depth, and, although no record was kept of the beds passed through, 

 the following, given me by one of the proprietors, from recollection, is 

 probably approximately correct : 



Ft. In. 



No. 1 . Drift clay 28 



No. 2. Blue clay shale 1-2 



No. 3. Hard gray limestone (Carlinville bed) 8 -1 



No. 4. Blueshale 30 



No. 5. Limestone (?) 2 



No. 6. Clay shale 1 4 



No. 7. Coal(No.8) 3 



No. 8. Fire clay 2 



No. 9. Clay shale, with nodules of limestone 8 



No. 10. Red shale 2 6 



No. 11. Sandstone and shale 55 



No. 12. Black shale (coal No. 7) 3 



No. 13. Sandstone (water-bearing) 30 



No. 14. Shale, with some limestone. . .- 15 



No. 15. Clay shale 3 



