THE CARBONIFEROUS SYSTEM. 145 



well, having a thickness of about 3 feet, and of good quality. In the 

 southern part of Tuscarawas county Coal No. 5 is generally thin, but of 

 good quality. At Urichsville it lies 30 feet below Coal No. 6, is 1\ to 3 

 feet thick, and not worked. At Port "Washington it has been opened on 

 the property of the new furnace company, and its fire-clay, there plastic, 

 is used for the manufacture of fire-brick. It is here 3 feet thick, and lies 

 at about the level of the base of the furnaces. On the bank of the river, 

 in the same vicinity, it is 4 feet thick, and lies 45 feet above the gray 

 limestone, and 65 feet below Coal No 6. 



In northern Muskingum and Guernsey, Coal No. 5 thins out and dis- 

 appears over quite a large area. Here the interval between Coals No. 4 

 and No. 6 diminishes locally to 20 feet, just as at Fredericksburg, Wayne 

 county, and we have in these two localities the opposite sides of the 

 basin in which Coal No. 5 and a great thickness of associated strata 

 were deposited ; a good example of local subsidence during the formation 

 of our Coal Measures. " Twelve miles north of Zanesville Coal No. 5 ap- 

 pears again, thickening to the south." (Stevenson.) 



In central and southern Muskingum county, Coal No. 5 is the first 

 workable seam above the Putnam Hill limestone, distant from it from 

 25 to 65 feet in different localities. It varies in thickness from 4 inches 

 to 4£ feet, and is generally esteemed as a good coal. It is the lower bed 

 at Eocky Point, 22 feet below the Nelsonville seam, with iron ore over it. 

 At Joseph Porter's, Hopewell township, it is 3 feet thick, 47 feet above the 

 Putnam Hill limestone, and 45 feet below the Nelsonville coal. At 

 Pork's Mill Run, near Zanesville, it is 4 feet thick, 28 feet below the Nel- 

 sonville coal, and 65 feet above the Putnam Hill limestone. 



" In Perry county this is known as the lower New Lexington seam. It is here 

 quite persistent, and has been considerably mined. At the mines of the Miami Com- 

 pany, on the branch of the Zanesville and Cincinnati Railroad, it is 3 feet 10 inches 

 thick, and is 22 feet below the Nelsonville coal." (Andrews. J 



About Nelsonville, Coal No. 5 seems to be generally present, though 

 scarcely at all worked. It is from 3 to 4 feet in thickness, and is said to- 

 be of good quality. 



"At the mines of the Hocking Valley Coal Company, York township, Athens 

 county, this seam is found at a distance of 27£ feet below the main Nelsonville 

 seam. It was not measured, but is there popularly called the "3-feet vein." (An- 

 drews.) 



On the west line of Ames and Trimble townships, Athens county, CoaL 

 No. 5 lies 35 feet below the " Great vein " (No. 6), and 30 feet above the 

 Putnam Hill limestone. It is said to be here 4 to 5 feet in thickness. 

 10 



