152 | GEOLOGY OF OHIO. 
In Stark county Coal No. 7, with its blackband ore, occurs only in the 
hilltops in Robertsville and Osnaburg, and in Carroll county only in 
Ross township, between Waynesburg and Morges, where it is worked 
by Messrs. Rhodes and Card, of Cleveland. 
In Holmes county Coal No. 7 is found in the tops of the hills both 
east and west of the Killbuck. It has herea thickness of from four to six 
feet, and is of good quality, but it has little cover, and is sparingly 
worked. No blackband ore is found over it. It here varies from 43 to 
100 feet above Coal No. 6. In the eastern part of Carroll county Coal 
No. 7 is worked in various places near Mechanicstown and Waltsville. 
Thence it is traceable continuously down Big Yellow Creek to Hammonds- 
ville, and into the valley of the North Fork of Yellow Creek at Saline- 
ville. In all this region the coal is of excellent quality, and is exten- 
sively mined and shipped. At Salineville it les 54 feet above No. 6; 
near Yellow Creek, from 50 to 70. At Salineville it is known as the 
“Salineville strip vein.” It is here the highest workable coal in the 
series, and is overlaid by 300 feet of the Barren Coal Measures, strongly 
marked by heavy beds of red shale. The crinoidal hmestone (Ames 
limestone) here les 250 feet above it, and a nodular, earthy limestone 
occurs a few feet below it. 
Toward the eastern margin of the State, Coal No. 7 lies from 50 to 60 
feet above Coal No. 6, and is there the uppermost workable seam, the 
gray and red shales of the Barren Measures reaching to the tops of the 
hills. In this section it is about three feet thick, and, as at Salineville, 
is an excellent coal. Its relations to Coal No. 6 may be well seen at 
Palestine, where it is the seam worked by Burnett and Joy, while the 
next lower coal (No. 6, “Upper Freeport,’) is the Carbon Hill seam. 
About the mouth of Yellow Creek Coal No. 7 is known as the “ Groff 
vein,” and a few miles below, on the Ohio, it has been extensively worked 
at New Cumberland, in West Virginia, and on the Ohio side opposite. 
Here it is four to four and a half feet thick, and of superior quality. 
Near Steubenville this seam appears to run out, and no workable coal is 
found between the Steubenville shaft coal, No. 6, and the Pittsburgh 
seam, No. 8, an interval of over 500 feet. 
In the southern part of Carroll county, about Leesburgh, Coal No. 7 is 
well developed, acquiring a thickness of four and even locally five feet, 
and is of fair quality. It is quite largely mined in this vicinity, and in 
the corner of Harrison along the railroad. Thence it is traceable by a 
continuous line of outcrop into the valley of the Stillwater, and up that 
valley to Freeport, near which place it dips to the south and,east below 
the surface and disappears. In all this region it is practically without 
