926 GEOLOGY OF OHIO. 



of tbe fact that the points last named are the only ones high enough to 

 reach tliis horizon, it may be added that these two localitiep, viz., Schultz's 

 Hill and Ilesboro were among tho^e selected by the United States Coast 

 Survey for signal stations in their recent operations in this part of the 

 State. Thefact that they overtop the country around them is thus attested. 



From Schultz'8 Hill eastward and northwaid, 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, Esq., 

 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 singla exception is the Baird ore with its accompanying 

 limestone, which is not to be recognized in its proper place in 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 poiat. 



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 1or most of the space. 



The Snow Pork ore is seen a few feet below the Nelsonville coal, the 

 bed of the run being filled with the massive nodules that have been 



