878 . GEOLOGY OF OHIO. 
for the supply of the numerous potteries that are established here. The 
structure of the coal at Roseville is shown below: 
RiGURE LaeXv 
STRUCTURE OF MIDDLE KITTANNING 
Bo Kee) AT moSev Ie 
Rlack S = 
MWS) WOR poe ae 
ONTOS SOY rye J 
Coy De ee ey Se " 
LD 
The change already referred to in the expansion of the lower bench 
of the coal:seam is especially to be noted here. From the Owens mine, 
in the Muskingum Valley, to Roseville, the distance is about 6 miles. 
The lower bench has increased in this direction from 15 to 26 inches, 
while the upper bench has been reduced to the extent of 6 inches or 
more. 
The coal of this field it will be better to consider in connection 
with the Perry county series, all the statements that are made in regard 
to the coals of Harrison, Clayton, Pike and Bearfield being applicable 
to the seams of clay and Newton township as well. 
THE UppEeR FREEPORT COAL. 
This important seam can be followed from Guernsey county into 
and across Muskingum county. No basin of it has yet been discovered 
in the last named county that is fully equal in value to the Cambridge 
coal field, but there are several districts in which it has already a 
recognized value and importance, and one other, but little developed as 
yet, will be pointed out, which gives excellent promise. 
The seam first makes its appearance in coming from the eastward, 
in Monroe township, where it exhibits the same fitful and inconstant 
character that it shows in the adjoining township of Guernsey county. 
It is said to be mined on a few farms near Otsego. The horizon 
ean be traced with great distinctness throughout Adams, Madison 
and northern Washington, but the coal is, for the most part, thin 
and worthless. In the southern portion of Washington, in Perry, 
‘Wayne, Salt Creek, Harrison, Brush Creek, and Clay townships, it 
