210 GEOLOGY OF OHIO. 
as arule, to go into the general market, but there are many localities 
where the quality is good. It is on the whole very steady, but it is, of 
course, sometimes wanting where it is due. In the high rocky bluff 
overhanging Yellow Creek Station, for example, the place and the clay 
of the seam are clearly shown, but there is not a trace of coal. 
Along the Ohio Valley the Roger coal has been worked at many — 
points. It is found in every neighborhood in which there has been a 
considerable demand for coal. Mines are opened in it at Elliottsville, 
at Toronto, and at numerous other points. It holds a thickness of 30 
inches and upwards. On the West Virginia side of the river, in the 
valley of King’s Creek, it grows stronger, reaching a measure of 3 feet, 
and even 4 feet. It gradually falls along the southward course of the 
valley, until it comes to water level at Will’s Creek. Beyond this, it 
becomes the Steubenville Shaft seam, finding here its finest develop- 
ment, and taking rank with the best seams of the State. From Steuben- 
ville, the coal passes to the north and west under heavy cover. When 
its horizon is next reached in the valleys of Yellow Creek, on the north 
side of the county, the coal is again found in excellent condition, though 
somewhat thinner. There seems reason to believe that Cross Creek, 
Island Creek, Salem, Springfield, Ross, and Knox townships are under- 
lain with this important seam. 
The Upper Freeport coal is of very little value in Jefferson county, 
outside of its development in the northeast corner, in Saline, Ross, and 
Knox townships. In the two latter it is not known to be of great 
a 
value. 
Only one important mine is now in operation in this seam, viz., 
the Diamond Coal Company’s mine, at Linton. 
West of the Ohio River, and south of Yellow Creek, it seems to 
fail absolutely for a large district. 
Its limestone and clay are everywhere ben and are occasionally 
worked, but the coal dies almost without a sign. 
THE Dramonp Coa MINE. 
This well-known body of coal, the thickest in the region, situated 
at Linton, just above Yellow Creek Station, on tne Cleveland and Pitts- 
burgh Railroad, stands by itself among the coal mines of the county. 
There are several anomalies in its structure and associations, and it is 
but recently that some of the most perplexing of them have been satis- 
