1054 . GEOLOGY: OF OHIO. | 
BLGQURE Ch 
STRUCTURE OF UPPER FREE PORT 
COAL AT JACOB WEBSTER’S VALLEY 
Sandstone-------- 
Shale roof. 1 DERE Ma = { 
Coal orcaless eS aie = : 
Parting 
COTS LB oi ee eee 
Parting, persistent.. 
Coal -.-- Ags gat OR Peete 
Parting ____._-. ; 
Coal main bench -___. 
The seam consists essentially of two benches—a lower one, measur- 
ing 4 feet, in which almost its entire value lies, and an upper bench 
that here exceeds 1 foot. A persistent clay parting, 6 inches in thick- 
ness, separates the two benches. Under the main parting a thin band 
of coal is found, separated from the main body by a thin layer of shale. 
This middle band could not be gained in mining under the present 
system, even if its quality warranted, as the expense of splitting it out” 
would exceed its value. The roof coal or upper bench is generally 
coarse and worthless. 
A heavy mass of slate overlies the coal, and it may reasonably be 
expected to form a good roof in regularly worked mines. In these 
country banks it proves somewhat troublesome and dangerous by falling. 
A half-mile beyond Webster’s, the fine showing of the seam on 
John Strait’s farm is found. The coal has been worked here to a small 
extent, and it nowhere appears to better advantage. | , 
On the farm of Thomas Cooper, a mile southward of Webster’s, 
another bank is opened in the seam. Its structure at this point is indi- 
cated below: 
