one 
252° _» GEOLOGY OF OHIO. 
the coal the shale soon falls in the main entries, leaving the sandstone 
for the permanent roof. Wea 
Rooms are generally worked 20 fect wide, and pillars. are left 10 
feet thick. The aim of the system now in force in the mines is to bring 
all the coal back. | on 
The average daily output of a miner is 3 to 4 tons. The mines of 
the district have a large capacity, but they are now producing only 
15,000 to 20,000 tons per month. 
The coal maintains the traditions of the seam in being confined 
almost exclusively to the production of steam. It finds its chief market 
on the steamers of Lake Erie. 
Sherrodsville is the furthest point to the southward at which a 
shipping mine occurs in this seam, but the coal holds with good volume 
and full value as far south as Bowerston, at least, and the line of the 
Pan Handle Railway. At Leesburg there is a mine that has been 
worked for many years, and the coal furnished by it has an unusually 
good reputation through the surrounding country. There is no good 
ground for questioning the identity of the Leesburg and Sherrodsville 
coals. At Bowerston, also, the coal has long been worked. It is now 
mined on a small scale by James C. Messenger. The structure of the 
seam at this point is shown below, the coal having a thickness of 3 ft. 
4 in. to 3 ft. 6 in.: 
FLGUAE XUV hit 
STRUCTURE OF BOWERSTON COAL. 
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The seam can be traced westward along the line of the railroad 
with ease and certainty. At Wyandt’s Bank, and in that vicinity, 3 
miles west of Bowerston, it is shipped in the small way. Its structure 
here is shown in the following diagram : 
