316 GEOLOGY OF ILLINOIS. 



The mines formerly worked by Messrs. Camp and Powell at Oneida, section 

 36, township 13, range 2, also belongs to this seam. The mine was closed at 

 the time I was there, so that I was unable to make any examinations. The 

 seam was reported to be quite thin, but with the usual clay parting. 



The following analyses of three specimens of this eoal are taken from the 

 first volume of this report, and were made by Dr. Blaney, of Chicago : 



Weight of a , . , Volatile combusti- n , i .1, r> i 



f. f , Moisture. Carbon in coke. Ashes. Coke, 



cubic foot. ble matter. 



1. 78.4855 12.0 27.2 55.2 5.6 60.8 



2. 81.5112 8.8 30.8 58.0 2.4 60.4 



3. 79.4892 11.6 29.3 55.9 3.2 51.1 



No. 1 was from near the top of the seam ; No. 2 from just above the clay 

 band, and No. 3 from below this band. 



This seam is only found in the higher portions of the county, which are 

 principally in the eastern half, and north of Spoon river. The river divides this 

 seam, leaving a small portion in the southeastern part of the county. Here it 

 is found along Kickapoo and Littler's creeks, in township 9, range 4, and 

 probably underlies the lands between the two in the southeastern part of the 

 township. At a single point in section 15, township 10, range 4, there are 

 some mines that appear to belong to this seam. North of Spoon river this 

 seam underlies the western half of Victoria, township 12, range 4, a portion of 

 the northern and western parts of Copley, township 12, range 3, and a part of 

 the eastern half of Sparta, township 12, range 2. 



At most of the mines in the county, this coal is of good quality, and no 

 other seam, unless it be No. 2, furnishes as good blacksmith's coal. " Horse- 

 backs," or slips, are not very numerous, though occasionally occurring. At 

 present this is the most valuable seam worked in the county. 



The next seam, No. 4 ? of the Illinois section, usually lies from forty to sixty 

 feet below this one. As there is no place in the county where the two are ex- 

 posed, I was unable to obtain a section of the strata between them. This coal 

 is seldom less than three, or more than four feet in thickness. Mines, which 

 appear to be in this seam, are worked in sections 2 and 3, township 13, range 

 1. A section obtained from here showed : 



FEET. IN. 



1. Limestone 1 6 



2. Clay shale 8 to 10 



3. Coal 3 " 5 



4. Clay 3 



5. Sandstone. Not measured 



These are the only coal mines that have been opened in this part of the 

 county, and there are none in the adjoining parts of Mercer and Henry coun- 

 ties. A mine has been opened in this seam in the eastern part of section 25, 



