778 GEOLOGY OF OHIO. 



and No. 8 frequently carries pyrites. At Mr. Nelson's bank, which is not 

 more than one hundred and fifty yards from the last, the bed shows — 



FT. IN. 



1. Eoof coal 6 



2. Clay to 1 6 



3. Coal 5 



This presents little difference from the other. Pyrites, as well as car- 

 bonate of lime, sometimes occurs in films upon the faces in the lower 

 coal. These two openings are typical in character of those in this vicin- 

 ity. The coal is a good gas coal and an excellent fuel, but for all purposes 

 is regarded as inferior to that obtained from Coal No. 6, in the Steuben- 

 ville shaft. The slack makes good coke in ovens, but burns too freely to 

 coke in heaps. In several instances slack-heaps caught fire, and instead 

 of coking were reduced to ashes. As there is too much sulphur in the 

 coke to admit of its use in the manufacture of iron, the slack is not util- 

 ized. The coal is quite soft, and is mined by wedging. One man can 

 take down and put out sixty-five bushels per day. At Mingo this bed 

 is but four feet thick. 



The limestone, twenty-five feet below the coal, is quite fossiliferous, 

 containing many imperfect lamellibranchiates along with almost innum- 

 erable gasteropods. It is extensively used in the manufacture of lime. 

 Attempts have been made to employ the Crinoidal Limestone for this 

 purpose, but they have always been unsuccessful. The rock is very com- 

 pact, and contains the characteristic grouping of species. 



About twenty-five feet below the Crinoidal Limestone is a small coal, 

 varying from twelve to fifteen inches in thickness. It is fully exposed 

 on the road leading from Mr. Nelson's bank. Many years ago it was 

 opened by Mr. Nelson's father, who found the coal very pure. It was 

 much prized by blacksmiths in the vicinity, not only because it gave a 

 quick, hot fire, but also because it was so remarkably clean. It is seen 

 in several of the adjacent ravines, and shows little variation in thick- 

 ness. It occupies the relative position belonging to Goal No. 76, which is 

 found in Harrison and Carroll counties, but was not seen elsewhere in 

 Jefierson county. 



The sandstone at the base of our section is quarried near Steubenville, 

 and proves to be a very pretty, though rather soft, building stone. 



