82 GEOLOGY OF ILLINOIS. 



coals are thick enough at this point to be worked. The following section was 

 made here, commencing at the top of the bluff: 



FEET. IN. 



Sandstone 10 



Buff-colored, thin bedded limestone , 4 to 6 



Shale 12 



Bituminous shale, (Coal No.' 3,) 2 " 3 



Shale 42 



Thin coal, No. 2 6 



Fire clay and shale 20 



Thin coal, No. 1 6 



Fire clay, shale and iron ore ; 6 



Sandstone 6 



This is the only locality that we met with in the Coal Measures of this 

 county, where one or more of these coal seams was not developed of sufficient 

 thickness to be worked, but there may be other points also, where the coal is 

 either absent altogether, or replaced with bituminous shale. 



At the place formerly owned by Mr. James A. Chadsey, on section 32, 

 township 2 north, range 1 east, there are two bands of iron ore in the shale 

 below coal No. 2, that will afford a very good ore for the manufacture of metallic 

 iron. These bands of iron ore occur just above the horizon of No. 1 coal, 

 which is not developed here, and they are respectively 12 and 6 inches in 

 thickness, separated by about two feet of shale. The section at this locality 

 is as follows : 



FT. IN. 



Massive sandstone 30 to 40 



Silicious limestone ., 3 " 4 



Bituminous shale, (Coal No. 3,) 3 " 5 



Shale 27 



Hard gray limestone 6 



Shale 14 



Brash coal, ) 1 



Shale, V Coal No. 2. 2 



Coal, } 2 



Shale and sandstone , 12 



Iron ore 1 



Shale 2 



Iron ore . 6 



Shale, with thin bands of iron ore , 6 



Sandstone and streaks of coal, (No. 1,) 18 



Hard gray limestone, of the St. Louis group 10 



A little west of Chadsey's place, coal No. 2 has been worked by Mr. John 

 Rebman, where the seam is three feet thick, according to the report of those 

 living near, but the roof had fallen in so that it could not be measured when 

 we were at the locality. It is probable that the parting of shale, which 

 separates this coal in the foregoing section, has thinned out here so that the 



