‘1144 a - GEOLOGY OF OHIO. 
In Section 20, Elizabeth township, on Etna Furnace PDs) the 
seam is shown again in normal structure : | 
FiLGURE CxLW 
STRUCTURE OF LOWER KITTANNING © 
COAL ORS) AT ETNA FURNACE. 
GMirating See | : : 
\ 
Bone Ce Say 
five - bie hs a ae 
In the workings, however, the roof shales, known as “the draw- 
slate,” are often cut away, to the detriment of the seam. 
The New Castle Field. 
The largest and the only important mines in the seam in these 
counties are found at New Castle, on the railroad to Pine Grove Fur- 
nace, and at Vesuvius Station, on the Iron Railroad. By the New 
Castle mines the supply of Hanging Rock is produced, and they also 
furnish a large: amount of coal for river steamboats. The Vesuvius 
Station or Tunnel mines furnish almost the entire supply of Ironton, 
both for manufacturing and domestic uses. Three rolling mills, in 
particular, rely entirely on the Tunnel mines, and, in fact, it is upon 
these mines that all the manufacturing interests of Ironton have been 
built up. Jor all uses, the coal is fairly well approved. The seam 
holds quite uniformly and steadily a thickness of 42 inches. It lies 
20-24 feet above the limestone. Its structure is shown below: 
WLQURE CXR 
SECTION AT EW eee Cal Nod. 
Sanacdstone Rook ____ 
pees pombing 
Oo. 
aoe , pax) Sisal st = 
fo PS 
Poot Goal_____---_-_ i 
