18(5 GEOLOGY OF ILLINOIS. 



FEET. IN. 



1. Clay shale 16 



2. Sandstone 32 



3. Clay shale ... 1 



4. Coal No. 6 4 



5. Fire clay 13 



6. Limestone 2 7 



7. Fire clay 10 



8. Clay shale 8 



9. Fireclay 15 



10. Shale 5 6 



11. Softblueslate 22 7 



1 2. Black slate 5 



13. Coal No. 4 4 6 



14 Fireclay , 6 9 



No. 2 of this section is a light colored, laminated sandstone, containing a 

 few remains of fossil plants ; in the more southern shaft it seems to be replaced 

 by a conglomerate. No fossils were obtained from any of the other beds ex- 

 cepting the black slate (No. 12) over the lower coal, which cantained, in great 

 abundance, Lingula umbonata, Aviculopecten rectalaterarea, Cardinal fragilis, 

 and other fossils characteristic of the shales of this coal. A rather peculiar 

 feature, however, is the comparative rarity of Discina nitida, usually the most 

 abundant fossil in this slate, only one or two specimens being found in a rather 

 protracted search. 



In the northern and eastern portions of .McLean county, we have only the 

 records of several borings, which afford but few particulars as to the character 

 of the underlying beds. Just over the county line, in Livingston county, 



Fire clay > , 4 6 



Sand rock 20 6 



Soap stone, (clay shale) 62 5 



Black slate 2 7 



Fireclay 1 7 



Sulphurons rock , 1 2 



Gray slate , , 11 1 



Shale 1 2 



Hard, lime rock , .....? 2 1 



Gray slate 2 8 



Soapstone, (clay shale) 6 8 



Coal 3 8 



The distance between these lower seams is 133 feet and 1 inch at this shaft, and from the 

 thickness of the seam, and the character of the associated beds, I am inclined to regard the 

 lower coal in this shaft as No. 3 of the Fulton county section, given on pages 93 and 94. It 

 is possible, however, that No. 3 is represented in this shaft by the 2 feet 7 inch bed of black 

 slate, and that the lower coal here is really No. 2. A. H. w. 



