17 
874 GEOLOGY OF OHIO. 
The Middle Kittanning Coal. 
The Middle Kittanning seam, known as the Upper Zanesville coal, 
or No. 6, has already been shown to be the most remarkable seam of 
the Lower Measures of Ohio in steadiness and persistency. These 
characteristics it retains in full measure in Muskingum county. It 
enters the county from the northward, extending from the Coshocton 
line to which its development has already been traced in the preceding 
chapter, in a sheet, the continuity of which is scarcely broken, except 
by the accidents of the great system of erosion which is still in progress. 
It is due above the drainage levels in the following townships of 
the county, viz., Monroe, Adams, Madison, Cass, Muskingum, Falls,. 
Washington, Wayne, Springfield, Newton, Clay, Brush Creek and 
Harrison, and also in Zanesville corporation. In all of them the seam 
is mined, and in several of them to quite a large extent. It is mined 
for the general market in railroad or river mines, in Washington, New- 
ton, Clay, and Brush Creek townships, and, as was stated under the: 
previous head, the very large local supply of Zanesville is mainly 
furnished by carts and wagons running from mines contained within 
the city limits. 
The seam falls short of 3 feet in parts of the field, and it nowhere 
yields fully 4 feet of coal, but it holds, with surprising steadiness, a 
measure ranging from 30 to 42 inches of coal. Its structure, too, is. 
maintained with great regularity over large areas. ‘The structure of the 
coal in the Harper mine of Mill Creek Valley, sixth ward of Zanesville,. 
is shown in the following figure: | 
FLGURE LXAVY 
STRUCTURE OF MIDDLE KITTANNING 
Sous HARPER'’SMINE ZANESVILLE. 
False Roo == 9’ 
ire - clay 
The same figure would answer without essential change for all the 
northern and central townships. The lower bench expands or contracts. 
a little, but the upper is very uniform. To the southward, however, a 
change occurs. In Newton and Clay there isa considerable thickening 
of the lower bench, accompanied by a reduction of the upper bench.. 
