926 GEOLOGY OF OHIO. 
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of the fact that the points last named are the only ones high enough to 
reach this horizon, it may be added that these two localities, v'z , Schultz’s 
Hill and Ilesboro were among those selected by the United States Coast 
Survey for signal stations in their recent operations in this part of the 
State. Thefact that they overtopthecountry around them isthusattested. 
From Schultz’s Hill eastward and northward, the ore and lime have 
been extensively worked, the ore here being known as the Baird ore. 
The report now published is founded on sections accurately measured 
and connected as closely as possible through the several divi-ions of the 
field. The plan has been, after becoming acquainted with any locality 
and after measuring as many sections as possible with the hand level, 
to select some one representative section and to re-measure this with the 
engineer’s level. These representative sections have been taken in 
every county of the district. Two or.three of them are introduced here 
to show the detailed structure of the regions to which they belong more 
fully than it has been thus far given. 
The first of these sections was taken on the land of John L. Gill, Fisq, ‘ 
on Meeker’s Run, below Nelsonville. It is a thoroughly representative 
section, embracing every valuable element but one that is due in a 
vertical range of two hundred feet at the very heart of the Lower Coal 
Measures. The singl2 exception is the Baird ore with its accompanying 
limestone, which is not to be recognized in its proper placein the series as 
far as shown. Thesectionisunusually complete, theopenings being made 
so frequent and so extended that it is scarcely an exaggreation to say 
that the hill from which it was taken is faced from top to bottom. The 
intervals in almost all cases are those usually found in this part of the 
district. The Cambridge Limestone is, however, ten or fifteen feet 
nearer to Coal No. VI than in most sections. : 
The intervals above the Nelsonville coal are measured from it, accord- 
ing to the custom throughout the region in which the seam is so largely 
developed. 
The lowest element of value in the section is Coal No. V. It is here 
shown with a thickness of two feet, underlain with the usual:white clay 
and shales, but, as already remarked, while the horizon of the Baird ore 
and the Gray Limestone is reached, neither of them appears at this par- 
ticular point. 
The distance between Coals No. V and No. VI is found to be greater 
than in many sections by a few feet. The interval is filled with a soft 
sandstone for most of the space. 
The Snow Fork ore is seen a few feet below the Nelsonville coal, the 
bed of the run being filled with the massive nodules that have been 
