358 



GEOLOGY OF OHIO. 



served in the county, but as the roof is sandstone, it is more liable to be 

 reduced in thickness as the entry is carried farther into the hill. 



It will be apparent that the coal of the county is quite limited in 

 quantity, and that, aside from the cannel, none of it is of first quality. 

 Further explorations may disclose openings where it is thicker, and a 

 considerable amount may be mined for local consumption. 



Carboniferous Conglomerate. — The following section, prepared by Mr. 

 Hertzer from the fossiliferous limestone at the top of the hill above Dr. 

 Wilson's old coal entry to the bed of Licking River, and which I have 

 modified slightly as the result of subsequent observations, exhibits the 

 relations of the Conglomerate to the other rocks where it reaches the 

 maximum thickness observed in the county : 



Coal seam , 2 to 3 



^^ggaagsaygy Shales, with iron ore 10 



' iff ifCTift{feS°?«l?^S l Coal-measure Conglomerate 15 



Thin sandstone flags, with small Prodmcta and Orthis 

 Michelini 65 • 



Coarse-grained sandstone 



Arenaceous shales 



Thick, yellow sandstone layer 



Ai-gillo-arenaceous shales, with Sangnmolites ( 



Thick, yellow sandstone layer, with AvioulopecUn, 



Plafyceras, Phillipsia, etc J 



Dense conglomerate, with Spirlfera, etc 2to 3 



60 



Yellow sandstone, with Nueula, GoniatUes, Platyceras, 

 etc 



Blue arenaceous shales, with bauds of saijJstone, con- 

 taining A'^itcu^a, Plerinea, Cjiprivardia, (?) and Sangu- 

 inolites 



75 



The iron ore, which here overlies the Conglomerate, is of special inter- 

 est, as in many places in the county this alone, resting directly on the 

 Waverly, marks the horizon of the Conglomerate. As a silicious iron 

 ore, some o£ it is of great excellence. It caps some of the hills in New- 

 ton and Mary Ann townships, and, judging from the debris around the 

 old charcoal furnace, in the latter township, was the source of supply of 

 the ores there used. 



In the hills, on the south side of the Licking, east of Newark, the Con- 



