680 GEOLOGY OF OHIO. M 



About twenty feet above this, is the Great Vein coal, which is here 

 finely developed, and, with the iron ores and limestones, constitutes the 

 great mineral wealth of this region. 



This coal is mined by the New York and Ohio Coal Company, by drift- 

 ing, near the north-west corner of Section 4, York township, where the 

 coal is nine feet thick, and where large quantities have been mined and 

 shipped. The section is here, from above : 



• FT. 



Sandstone, exposed 20 



Shale 6 



Coal, in three benches ^> 9 



The sandstone approaches abnormally near to the coal, and northward 

 it has, in places, cut away all of the shale and the upper part of the coal. 



Along the valley of Snow Fork, from the north line of Ward township 

 to the north line of Section 4, the coal is well exposed, generally a little 

 above drainage, and is of re'markable excellence. 



At the Cawthorn bank, on Monday Creek, above its junction with 

 Snow Fork, the following measurements were taken : 



FT. IN. 



Shale 15* 



Coal 4 to 6 



Shale 3 



Coal 22 to 24 



Shale li 



Coal 22 to 24 



The coal is of good quality, with little sulphur, and in all respects 

 much like that of Shawnee and Straitsville. 



A full section of the rock strata, exposed at this point, is as follows ; 



FT. 



Ferrnginous shales 50 



Crinoidal limestone 3-4 



Shaly sandstone 50 



Coal (reported thickness) 3 



Not exposed (to bench in hill) 20 



Sandstone 70 



Calcareous iron ore 5 



Ferruginous shale 20 



Drab limestone, with iron ore 4 



Shaly sandstone and yellow shale 30 



Coal : 4 



Ferruginous shale 30 



Coal, Great Vein 9 



Blue shale, with iron ore 8 



*Blue shale, with nodules of iron ore, eight feet. 



