WEST VIRGINIA GEOLOGICAL SURVEY. 



Probable Amount of Redstone Coal. 



535 



Totals j!55 . 52|99,532.8|16,947,418,752|677,896,750 



THE PITTSBURGH COAL. 



The Pittsburgh Coal, discussed previously in Chapter VI, 

 pages 129-130, is shown by outcrop lines on Map II in those 

 regions where it is of noticeable thickness above drainage. It 

 is also used as the basis of the green structure contours, these 

 lines representing the elevation of its base above sea level, 

 and is an important minable coal in northern Hackers Creek-, 

 nearly all of Freemans Creek, nearly all of Courthouse Dis- 

 tricts in Lewis, and in southeastern Troy, eastern Glenville, 

 and southeastern and southwestern Center Districts, Gilmer. 

 Map II shows by an appropriate symbol the limits west and 

 north of which this coal is not of minable thickness, the dis- 

 appearance along this line being, in most localities, abrupt, as 

 though an ancient deepwater shore line prevented the growth 

 of the vegetation which formed the coal, and Figure 6 gives 

 this information in condensed form. In those regions where 

 the coal is found it is nearly always of the same uniform 

 physical structure, usually having but one streak of bony coal 

 near the middle, which, in some cases, contains so much addi- 

 tional volatile matter that buyers do not object to its presence 

 in the car. Chemically, the coal is unusually high in volatile 

 matter, the tested samples averaging 41.82 per cent, or about 

 5 per cent, higher than the same coal in the Monongahela 

 Valley north of Clarksburg. The sulphur content is too high 

 in most analyses to permit the coal to be used for by-product 

 or metallurgical coke, but if a means of washing about half of 

 this impurity from the coal could be devised, its possibilities 



