48 J. J. STEVENSON CAKBONIFEEOUS OF APPALACHIAN BASIN 



beyond which the sudden southward rise of the measures and decrease 

 in height of the hills prevent direct tracing of the higher beds. To 

 increase the difficulty, the continuity is broken by a broad valley, cut 

 down to the Pittsburg coal bed, whose decayed outcrop is on the surface. 



The highest coal bed is double, 2 feet 2 inches at the most northerly 

 exposure and 2 feet 9 inches at 2% miles from Meyersdale. The under- 

 lying limestone, 152 to 160 feet above the Pittsburg coal bed, the 160- 

 foot limestone of the Platts, is 10 to 12 feet thick and continuous at 

 the northern exposure, but at the most southerly exposure of the full 

 section it is divided, with 2 feet of coal above the middle. It is quarried 

 at several places and always yields lime of great purity. The limestone, 

 No. 10, from 72 to 87 feet above the Pittsburg, the 90-foot lime- 

 stone of the Platts, is 5 feet thick at the northern exposure, but increases 

 to 10 feet at 2 miles northwest from Salisbury. It has been opened at 

 a few places, but it is very impure everywhere, contrasting in this respect 

 with the upper limestone. 



The "Bedstone," or 44-foot coal of the Platts, is 25 feet above the 

 Pittsburg in one section and 35 feet above that bed in three other sec- 

 tions, of which the most southerly is about 3 miles southwest from 

 Meyersdale. The material filling the interval in these sections is the 

 same throughout — sandstone, 15 feet; black shale, 20 feet. The com- 

 piled section for Salisbury given in the Somerset County report is 

 erroneous, as it shows a limestone below the "Eedstone," which, as may 

 be seen by reference to the text, does not exist there — or, as for that 

 matter anywhere else. There is no coal between the Pittsburg and the 

 "Eedstone," and the latter coal at the last exposure of the typical sec- 

 tion shows: 



Feet Inches 



Coal 2 



Parting — — 



Coal 1 3 



Clay 1 



Coal 1 3 



but at half a mile away it is 5 feet 6 inches thick, with the bottom 

 bench 4 feet. Here one reaches the broad deep valley, beyond which 



the section is : 



Feet Inchei 



Limestone Not measured 



Interval 65 



Coal bed 4 6 



Black shale 11 



Pittsburg coal bed Not measured 



