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 blackbani 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 

 I am 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 j 

 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 lees topographical and geological unity. I 

 therefore add a few pages of what may be called geographical geology. 



Tlie Tuscarawas Valky. — 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 jnining, 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 rather inferior quality. 



At and below Zoar, the Zoar limestone lies very near the water level, 

 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 



