COAL MEASUEES: 



Shale and limestone. 

 Coal No. 54 to 6 feet. 



Sandstone and shale. 



Coal No. 40 to 5 feet 



Shales and sandstone. 



Coal No. 3-0 to 4 feet. 



Shales. 



Coal No. 2 P/6 to 5 feet. 



Sandstone, shale and limestone. 



Coal No. 11 to 5 feet. 



Sandstone and conglomerate. 



Lower carb. limestone. 



Of the six lower seams represented in the foregoing condensed 

 section, where they outcrop in the valley of the Illinois river, five 

 are found of sufficient thickness to be profitably mined at some 

 points and will afford an aggregate thickness of about twenty feet 

 of marketable coal. They are not everywhere of uniform thickness, 

 however, as for example, No. 1, at Seville, in Fulton county, is three 

 feet or more in thickness, while at the outcrop, south of Lewistown, 

 on the north bank of Spoon river, it is too thin to be profitably 

 mined. At Prairie City it is reported at 3 feet in the shaft re- 

 cently sunk at that point, while in the vicinity of Colchester it is 

 nowhere thick enough to work, and is often absent altogether, or 

 represented by a bed of bituminous shale. 



At Eoodhouse, in Greene county, this seam was reached at the 

 depth of about ninety feet, passing through the following beds : 



Ft. In. 



Drift clay, soil, etc 75 



Blue and ash-colored clay shale 15 



Black shale 1 ft. to 1 3 



Coal 2 4 



Fire and potters' clays -. 18 



This is probably the equivalent of the Battery Eock coal, which out- 

 crops in the bluffs of the Ohio river a few miles below the mouth 

 of the Saline, and is there associated with the heavy bed of con- 

 glomerate that forms the base of the Coal Measuress in Southern 

 Illinois. The coal is there only about 18 inches thick, and the 

 mines formerly opened there have generally been abandoned. 



