80 | GEOLOGY OF OHIO. 
On a former page I have referred to the discovery by my associate, 
Prof. J. T. Hodge, of a well-marked stratum of blackband on the Still- 
water, some eight or nine miles south of Uhrichsville. No effort has 
been made, so far as I can learn, to determine accurately the extent and 
value of this deposit, but it affords another indication of the southward 
reach of the blackband, and such as should encourage further explora- 
tion in this part of the county: In this connection I will mention that 
Tam informed by Prof. J. J. Stevenson that a well-defined, though perhaps 
not extensive development of blackband is found on the farm of Mr. 
Proctor, in Liberty township, Guernsey county. 
In the preceding notes upon the strata, outcrops of which occur within 
the limits of Tuscarawas county, so much has been said incidentally of 
the geological structure of different localities, that those who have read 
these notes will probably have.a clear idea of the geology of the county ; 
but it has seemed to me that the interest and value of this report will be 
somewhat increased by brief sketches of the structure of certain limited 
districts which have more or less topographical and geological unity. I 
therefore add a few pages of what may be called geographical geology. 
The Tuscorawas Valley.—At the point where the Tuscarawas River 
enters the county, at Bolivar, it has cut through Coal Nos. 3 and 4, and 
these, with their overlying limestones—the Zoar and Putnam Hill—are 
visible in the hills on either side. The lower of the coals (No. 3) is 
rarely accessible, and is not of workable thickness. Coal No. 4 was, for a 
time, worked by Mr. J. A. Saxton, as has been before mentioned, this 
being the only point in the county, so far as I know, where it seemed 
worth mining, and, here its rapid changes of thickness, together with 
the somewhat inferior quality of the coal, caused the enterprise to be 
abandoned. : 
Coal No.5 is here good, is from three to four inches thick, and has been 
mined at various places on the south side of the Sandy valley, to and 
above the tunnel. The hills between Sandyville and Mineral Point are 
capped by the Mahoning sandstone, and the overlying shales, which are 
above Coal No. 6; this coal showing frequent outcrops, but everywhere 
thin and of faiWer inferior quality. 
At and below Zoar, the Zoar limestone lies very near the water ial 
in some places forming the bed of the stream. The Putnam Hill lime- 
stone lies some fifty feet higher, just at the break of the low hills on the 
east side. As usual, both these limestone carry more or less iron ore on 
their surfaces, and the ore of the upper stratum has been sparingly 
worked by stripping. Between Zoar and Mineral Point the hills rise 
above the level of Coal No. 5, and the band of kidney ore, which lies just 
