240 GEOLOGY OF ILLINOIS. 



Kickapoo, but it seems to correspond very nearly in position to a band 

 of sparry limestone at the top of the section at Kingston, given on a 

 following page. 



On section 18, in Kadnor township, we found a single layer of fine 

 grained gray limestone about thirty inches thick, traversed by thin veins 

 of spar, which may be the equivalent of No. 3 of the above section, but 

 as there was no exposure of the underlaying strata, its position could 

 not be positively determined. Below it we only saw a few inches of 

 pebbly clay resembling a fire-clay. 



Coal No. 7 is quite variable in thickness in this county, ranging from 

 one and a half or two feet on the waters of the Kickapoo, to three and 

 three and a half feet in the north-eastern portion of the county. On the 

 Kickapoo but few attempts have been made to work it in competition 

 with the thicker seams which underlie it and outcrop in nearly every 

 hill side, but in the northern part of the county this coal ranges from 

 three to three and a half feet in thickness, and as the lower seams are 

 there below the surface, this is mainly relied upon for a local supply of 

 coal. Armet and Dukes mines, two and a half miles north- west of Chill i- 

 cothe, are on this seam, and the coal is there thirty inches thick, over 

 laid by a rather soft bituminous shale about two feet in thickness. The 

 beds exposed at this point give the following section : 



No. 1. Sandy ferruginous shales - '"> I 



No. 2. Bituminous shale 



No. 3. CoalNo.7 2J 



No. 4. Sandy shales and sandstone 20 to 25 



No. 5. Arenaceous limestone - 



No. 6. Bituminous shale 1 to 3 



No. 7. Coal No. 6 * below the level of the creek. 



On Mr. Hunter's land, a little farther to the westward on the same 

 branch, the coal is three. feet thick, with about the same thickness of bi- 

 tuminous shale above it. It is also worked on the Snatchwine and at 

 Hallock's hollow five miles w r est of Chillicothe, but I did not visit these 

 localities. The shales overlaying the coal on Hunter's land con tains nu- 

 merous iron-stone concretions very similar in appearance to those found 

 on Mazon creek in Grundy county, but they contain no fossils here so 

 far as I could discover. Coal No. 6 is reported to be very irregular in 

 its development in this vicinity, and hence no systematic attempt has 

 been made to work it here. 



Coals No. 4 and 6 outcrop in the river bluff below the valley of the 

 Kickapoo, and also in the bluffs on either side of that stream nearly to 

 Edwards' station, where No. 6 gradually passes underneath the creek 

 valley. At Kingston, in the extreme south-eastern portion of the county, 

 both seams have been worked since the earliest settlement of the county, 

 and the mines here were among the first opened for supplying coal to 



