1002 GEOLOGY OF OHIO. 
4a or 4b, according as one or two coals are referred to the Clarion 
horizon. 
The limestone coal ranges, as a rule, between 3 and 4 feet in thick- 
ness, but sometimes rises to 6 or 7 feet. Itis bright and handsome, 
high in sulphur and moderate in ash. In the country banks where only 
the outcrop is worked, the coal mines small. Probably it will hold this 
characteristic under deep cover. ‘There are a few small shipping banks 
in this seam on the line of the Ohio and West Virginia road, one near 
Hawk’s Station, and others at and near Minerton. | 
The first of these supplies the locomotive of the road with coal;. 
the others ship a moderate amount southward into the coalless region 
traversed by the road. The seam makes its best appearance at the first- 
named point, as is shown in the appended figure : 
PiGURE EXXXY 
STRUCTURE OF LIMESTONE COALs - 
AT HAWK’S STATION, 
Black Slate, ossiliferous . Zi 
replacivug Lhe limestone == 
ros RN AOR Sad West 8) 
CV any parting , bearing Ten 
Cain, Ga SEE eo 
‘. 
Wherever of large volume, as in this case, the coal is rendered 
dirty by the interbedded slates. In many cases, also, the amount of 
mineral charcoal is excessive in the coal, producing the same result. 
The seam at Minerton has less thickness. Excellent opportunities. 
are afforded for a study of this important horizon in the railroad cuts 
in this neighborhood. The ore, limestone, coal and clay, all of them 
of economic value and interest, are shown in full-faced sections. The 
coal is seen to be unsteady when it has the limestone for a cover. This. 
coal seam extends from about the middle line of sections of Elk and 
Madison, southward to Lawrence county. The volume is amply sufficient. 
