900 GEOLe®T OF OHIO. 



localities. But few of the ores have individuality enough to render 

 identification safe when based on their qualities alone, but taken in con- 

 nection with the other elements of the section, we may make ourselves 

 sure of their continuity. 



In the appended section (Iron Ores of the Hanging Rock District), the 

 general order of the leading ore seams of the district is shown, and their 

 relations to the limestones already named are indicated. PLice is given, 

 as a general thing, only to those seams that have been worked. The in- 

 tervals between some of the limestones, it will be remembered, increase 

 as the strata are followed southward. This f.ict renders the connections 

 of some of the intermediate seams doubtful, but when the general and 

 particular stratigraphical order of one section is observed in another, it 

 is scarcely possible to avoid the identification of corresponding elements, 

 though no continuity of outcrop exists. To all of these doubtful or un- 

 certain cases attention will be distinctly called. 



1. The lowest ore shown in the scale belongs to this division. A de- 

 posit of ore is often found near the level of the lowest coal seam. The 

 best showing of this horizon occurs in Scioto county. An ore named the 

 Guinea Fowl has here been workf d for two or three furnaces to a small ex- 

 tent, and notably at Scioto Furnace. It is about fifteen feet above the con- 

 glomerate which occurs here. It is a heavy ore, of good thickness. Its 

 appearance is quite promising, and trial has, once and again, been made 

 of it, but it has never been approved. It is probably highly silicious, 

 and is certainly poor in iron. 



At the same horizon in Jackson county, and more particularly on Sec- 

 tions 19 and 20, Washington township, and in the northern sections of 

 Hamilton township, considerable ore is shown in outcrop. In Vinton 

 county, also, ore is seen at this level at various points. Most of the e3s- 

 posures noted lie in Richland township. Like a half dozen other ore 

 seams of the Lower Coal Measures, this one is frequently replaced by a 

 blue limestone. 



This is an ore horizon rather than an ore seam. There is nothing to 

 warrant the expectation that it will receive more attention in time to 

 come than it has already received. 



2. At an elevation of about fifty feet above the Waverly conglomerate, 

 a tbin limestone or flint, overlain with iron ore, sometimes occurs. The ore 

 has been worked to a small extent on the Westenhaver farm. Section 31, 

 Falls township, Hocking county, in connection with the fire-clay that 

 covers it. The flint or lime overlies a thin seam of coal, and this in turn 

 covers the fossiliferous beds of sandstone and shale that are included in 

 the Logan sandstone of Prof. Andrews. The lime, flint, and ore may be 

 marked by a similar designation, and are accordingly marked on the sec- 



