378 GEOLOGY OF OHIO. 



is a local one; the towns to the north and west generally send their 

 wagons to this bank for their coal supply. Unfortunately, there is a 

 large fissure in the floor of the mine through which comes a flow of water, 

 necessitating constant pumping. 



The succession of rocks in this region of the Coal • Measures, according to 

 Mr. Julian Humphrey, is as follows, and as he is senior partner of the 

 Diamond Coal Company, and a man who has had thirty years' experience 

 in drilling for coal, his statements are deserving of credit : 



FT. IN. 



1. Drift 20 



2. Coarse sandstone 40 



3. Dark soft sliale 6 



4. White clay 4 to 6 



5. Gray shale 16 



6. Chocolate shale 16 



7. Dark shale 16 



8. Coal 3to5 



9. Fireclay 1 to C 



10. Fire-stone, " Bottom rock." 



The last stratum, a quartzose sandstone, was not drilled through, as it 

 is extremely "hard." The Conglomerate is supposed to be below the 

 firestone. Mr. Coleman has put dowa perhaps seventy-five drill-holes in 

 this section of the State, and says that this, his ideal section, is always 

 essentially encountered where coal is found.. 



The roof shales of the Wadsworth coal mines are generally mazes of 

 fossil coal plants, all pressed into thin sheets, and printed upon the shale 

 as distinctly as if photographed. The thickness of the coal is, in some 

 cases, over five feet, but it is generally thinner, the larger portion of the 

 township affording only thin coal. This coal lies in "pockets" (local 

 basins), and as it is the lowest in the coal series of Ohio, and forms the 

 margin of the great coal basin, it is more irregular than the seams of coal 

 which were deposited subsequently. 



The Conglomerate is seen one and three-fourths miles south of the center, 

 by three-fourths of a mile west. A coarse-grained sandstone, locally a 

 conglomerate, is quarried somewhat extensively at a place one mile north 

 of the center of the village, on land owned by Henry A. Mills. The dip 

 at the quarry, as made out at the most north-westerly outcropping of the 

 ledge, is toward the north-west, and would seem to be a local exception 

 to the general dip. This is explicable on the supposition that here was 

 the limit of this deposit, and the slope was naturally to the shore, the 

 dip being in the opposite direction or south-east. 



The Conglomerate overlying the coal would appear to be the result of 



