144 GEOLOGY OF OHIO. 



Where there are two, the upper of these is an impure cannel, which is 

 nowhere of workable thickness. This is referred to in our reports as Coal 

 No. 5a. Below this is another seam, first seen at Harger's Mill, in Holmes 

 county, where it begins with a feather edge. In northern Tuscarawas 

 county this has become one of the most important coals in the series, 

 and one that is traceable over a large area toward the south and east. It 

 is well shown about Mineral Point, where it is the coal chiefly worked. 

 This coal seam was numbered 5a in our first reports from the supposi- 

 tion that it was quite local, but proving to be wide-spread and valuable, 

 it is, in our later publications, designated as Coal No. 5. Here it lies 

 about fifty feet above the gray or Putnam Hill limestone ; is a bright, 

 handsome, rather open-burning coal, four feet in thickness. It is roofed 

 with black shale, which contains a notable quantity of kidney ore. This 

 has been quite largely worked by stripping in the vicinity, and is a 

 marked ore horizon in all this region. 



Another distinguishing characteristic of Coal No. 5 in the vicinity of 

 Mineral Point is the fire-clay which underlies it. This is very pure, and 

 locally non-plastic. It is similar in appearance and properties to the 

 Mt. Savage fire-clay, and, like that, is largely used for the manufacture of 

 fire-brick of superior quality. 



In Stark county this coal is found in all the southern and eastern 

 townships, and is there known as the " 30-inch " seam, being thinner 

 than at Mineral Point, but retaining its good qualities, and being gener- 

 ally mined. 



On the Tuscarawas Branch of the Cleveland and Pittsburgh Railroad, 

 Coal No. 5 is worked at the tunnel, where it lies below grade, and is known 

 as the "tunnel" seam. It is also mined on the Trumbull Company's 

 property, below Waynesburg. 



At Alliance this is the seam worked in the shaft above the Pittsburgh, 

 Port Wayne and Chicago Railroad. It has here a thickness of 3£ to 4 

 feet, and is somewhat softer and more sulphurous than at Mineral 

 Point. 



In the valley of Yellow Creek this coal is known as the " Roger vein "— 

 the next one below the " Big vein " — has a thickness of 3£ to 4 feet, and 

 is a fairly good coking coal. 



In eastern Columbiana county Coal No. 5 is probably represented by 



the " Whan seam," a coal of very variable thickness, but locally swelling 



to 5 feet, and of excellent quality. 



In western Pennsylvania this is known as the Lower Freeport coal. 



Tracing Coal No. 5 southward from our starting point in Tuscarawas 



county, we find it at Dover mined on the hill above the Sugar Creek salt 



