230 GEOLOGY OF OHIO. 



National Road. At this opening the coal shows in the entry as fol- 

 lows: 



IN. 



1. Coal 12 



2. Slate 1 



3. Coal 19 



4. Slate i 



5. Coal 18 



6. Fire-clay & 



The coal is said to be five feet thick in the chambers, but these were 

 full of water, and no opportunity was afforded for measurement. A 

 specimen from this bank yields the following on analysis : 



Specific gravity 1.281 



Moisture 3.30 



Volatile combustible matter 32.30 



Fixed carbon 60.30 



Ash 4.10 



Total 100.00 



Sulphur 2.80 



Sulphur remaiuing in coke 1.40 



Sulphur formiug of the coke 2.17 



Fixed gas per pound, in cubic feet 3.80 



Character of the coke Compact. 



Color of ash Fawn. 



The same coal is worked extensively on the Central Ohio Railroad 

 by Mr. H. L. Williams, who opens it by means of a shaft. The coal is 

 shipped to various markets, and commands a ready sale at a fair price. 



Jefferson Township. — Though the soil here is very thin, yet the subsoil 

 is so thick as to conceal the rocks, and exposures are very few. The 

 Crinoidal limestone and Coal No. 7b were nowhere observed in the north- 

 ern portion, though both appear on the Salt Fork, where the latter is 

 worked. The hills are high enough in the north-eastern portion to catch 

 Coal No. 8, but it was not opened. At one or two localities along Salt 

 Fork it appears and is worked. 



On the property of Thomas Adams, in section 4, three miles from ' 

 Salem, Coal No. 7« is worked, and there we have the following section : 



FT. IN. 



1. Sandstone 10 



2. Shales 8 



3. Coal 3i 



4. Clay 5 



5. Coal 2 4 



6. Bituminous shale 4 



7. Fire-clay 1 3 



8. Sandstone 60 



