ECONOMICAL GEOLOGY. 33 



Braceville township, sec. 35. I found only 14 inches af coal at 

 this point at a depth of 65 feet. At the same point we got 3 

 feet 4 inches of coal at a depth of 146 feet. On sec. 19 in Essex 

 township, Kankakee county, north and east of the Wilson shaft, 

 the upper seam is found at a depth between forty and fifty feet. 

 This is its eastern boundary, and as the strata rise rapidly to 

 the eastward, both seams crop out within a short distance from 

 each other. The upper seam is best developed on sections 13, 

 24 and 25 in Greenfield township. On sec. 25, and on the farm 

 of Mr. Savage a little southwest of the Wilson shaft, the depth 

 is 106 feet; at the shaft on sec. 24, 80 feet; on 13 near the 

 center, 80 feet, and north about 80 rods from the east line of 

 the township, 69 feet, and on sec. 12 only between 40 and 50 

 feet. I have found it as far north as sec. 4, Felix township, 

 and the main seam below it, and so you will see that although 

 it is not a general deposit, it is distinct from the main coal and 

 belongs above it, as I have demonstrated. 

 Hoping this information may be of some use to you, I remain, 



Respectfully yours, 



T. S. CUMMINS." 



The upper coal described by Mr. Cummins, is no doubt identi- 

 cal with that which outcrops on Waupecan creek in Grundy 

 county, and was referred to No. 3 of the Illinois section. Owing 

 to the irregularity in the development of coal seams on the 

 northern and northeastern borders of the coal field, the exact 

 position to which this seam should be assigned is somewhat 

 problematical, and it may represent a higher coal than No. 3, 

 and the character of its roof and its distance from the lower 

 seam, which evidently increases away from the border of the 

 field, render its identity with coal No. 5 of the LaSalle section 

 not improbable. 



The boring at Clinton, made with the diamond drill, probably 

 penetrated to the ba,se of the coal measures, and passed through 

 352 feet of drift, showing that Clinton is located above one of 

 the ancient valleys, by which the surface of the state was in- 

 tersected anterior to the accumulation of drift material. The 

 following is a detailed copy of the record of this boring: 



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