COAL MINES OF NORTHERN PERRY COUNTY. 907 
skeleton section taken on the farm of Horace Wilson, Section 3, Mon- 
day Creek township. Some of the intervals are in excess of the usual 
measurements. ‘The section is as follows: 
Middle Kittanning coai, No. 6, “ Three-foot seam ”’— 
Interval—Shales—24 feet. 
Lower Kittanning coal, No. 5, ‘“‘Two-foot seam ’’— 
Interval—i1 feet. 
Baird ore, Ferriferous limestone 8-10 inches— 
Interval—70 feet. 
(Containing Tionesta coal, No. 3b, not shown here.) 
Upper Mercer limestone, 15 inches. 
‘c ‘ Cannel—16 inches. 
Coal, Col —20 faaher, 
Interval—45 feet. 
Lower Mercer limestone, in two benches, separated by 3 feet of clay. 
Interval—12 feet. 
Uniou Furnace block ore. 
It is in sections adjoining those last referred to that the Middle 
Kittanning coal makes its great increase in thickness and becomes a 
part of the Hocking Valley field proper. This change is always an 
abrupt one, and is confined to the upper portion of the seam almost 
exclusively. It will be discussed in the next chapter. 
The coal of northern Salt Lick township holds the same relation 
to the “ Great Seam” as the coal last described. The boundary be- 
tween the low and the high coal passes through Sections 12, 11, 15, 16 
and 17, and all the coal mined in the seam north of this boundary 
belongs to the northern phase of the seam, except that its ash is lighter 
colored and that it is less cementing in character. Coal of this type 
is mined largely in Sections 5, 6 and 8. The structure of the seam in 
J: EK. Payne’s mine at McCuneville is as follows: 
PLEURYH LX XA 
STRUCTURE OF MIDDLE KITTANNING COA LIN°6) 
AT MSCUNEVILLE, J.E.PAYNE’S MINE. 
a Oe Onn } ee 
Shales. aac bonzeoatl- 
