168 J. J. STEVENSON CARBONIFEROUS OF APPALACHIAN BASIN 



colored and fossiliferous, with, below it, the Brush Creek coal bed at 97 

 feet above the Upper Freeport. 



The Clarksburg limestone is present in the Friendsville section at 39 

 feet above the Morgantown sandstone, which is 84 feet thick and in part 

 conglomerate. The Elk Lick, Harlem, Barton, Brush Creek, and Gallit- 

 zin coal beds are all present, though all are thin, none exceeding 1 foot 

 9 inches. The Elk Lick, Ames, Cambridge, and Brush Creek limestones 

 are distinct, though the first is practically only calcareous shale, and all 

 except the Elk Lick are fossiliferous. Eed shale is associated with the 

 Cambridge limestone at nearly 200 feet above the Upper Freeport. 

 There is much sandstone above the Clarksburg limestone and some of it 

 is conglomerate, representing perhaps the Connellsville sandstone.* 



SECOND BITUMINOUS COAL BASIN OF PENNSYLVANIA 



Within the Second basin the Mahoning is present in small areas as far 

 north as northern Center county, where it is the protecting cover for the 

 Upper Freeport coal bed. At Karthaus, in Clearfield, Mr James de- 

 scribes it as 72 feet thick, with a 2 feet coal bed, the Gallitzin. Doctor 

 Chance's section in southern Clearfield shows two sandstone plates, 40 

 and 50 feet respectively, separated by 30 feet of shale, which holds at the 

 bottom the Gallitzin coal bed and the Mahoning limestone, this being 

 the most northerly point at which that limestone has been observed. The 

 lower Mahoning is coarse and at times conglomerate, f 



Mr dTnvilliers obtained a number of sections within a small area in 

 northwestern Cambria, which illustrate the variability of the lower part 

 of the Conemaugh. Two of these are: 



Feet. Inches. Feet 



1. Shales 20 20 



2. Sandstone 95 85 



3. Shales , 25 40 



4. Coal bed 8 2 



5. Shales 35 60 



6. Sandstone 40 35 



215 8 242 



In these there are two plates of sandstone, as in southern Clearfield, 

 and in each case a coal bed above the middle. The bottom of the upper 

 plate is at 100 and 137 feet above the Upper Freeport and the coal bed at 

 75 and 95. In another section the coal bed is at 137 feet, with only 



* G. C. Martin : Garrett county, pp. 128, 130, 134-135, 138-139. 

 t H. M. Chance: (H 7), p. 132. 



