278 



GEOLOGY OF OHIO. 



Coal No 8c is here sixty feet above No. 8, separated by sandstone, eight 

 feet; limestone, fifty feet; clay shale, two feet. The intimate structure of 

 the lower divisiion of No. 8 is as follows ; 



FT. IN. 



1. "Bone"coal 2 



2. Coal '. 2 



3. Clay parting f 



4. Coal 10 



5. Clay parting -J 



6. Coal 2 



5 IJ 



In No. 2 the pj'rites band is found one foot from the top and one inch 

 thick. No. 4 is highly prized by blacksmiths, and is said to be remark- 

 ably pure. Nodules of pyrites are not common. The coal on this run 

 is mined to a considerable extent to supply St. Clairsville, but is not re- 

 garded as equal to the coal from the Wheeling Hill mines on the National 

 Road. Specimens from the top, middle, and bottom benches were for- 

 warded for analysis, and gave the following results : 



TOP. MIDDLE. BOTTOM. 



Specific gravity 1.343 1.323 1.304 



Moisture 1.10 1.20 1.00 



Ash 8.00 5.00 5.70 



Volatile combustible matter 33.90 30.00 32.00 



Fixed carbon 57.00 63.80 61.30 



Totals 100.00 100.00 100.00 



Sulphur 4.53 2.47 1.92 



Sulphur left in coke 2.19 1.09 0.82 



Sulijhurformingof the coke 3.37 1.58 1.22 



Fixed gas per pound, in cubic feet 3.65 3.12 3.42 



Ash Gray. Gray. Gray. 



Coke Compact. Compact. Compact. 



On McMahan's Creek Coal No. 8 is mined for domestic use. At Mr. 

 Johnson's opening the lower coal is four feet eleven inches, and the roof- 

 coal is single, fourteen inches thick. In Mr. Brown's opening, not thirty 

 yards distant, the lower coal is four feet ten inche.s, while the roof-coal is 

 double, five inches and twelve inches, separated by six inches of shale. 



Colerain Towimhip. — In the northern sections of the township the land 

 lies at such an elevation that the ravines barely reach Coal No. 10, which 

 here seems to be quite thin and is not worked. The runs which empty 

 into Wheeling Creek show Coal No. 8 very finely for a mile or more above 



