119 



Jones.] i-L-i [Sept. 17, 



the Alleglianiesare here, however, taken up by a range of mountain fifteen 

 miles to the eastward, forming the border of the field (Davis mountain of 

 Maryland, and Front ridge of Virginia). Union is a point situated on the 

 great swell or uplift in northern West Virginia pointed out by Professor 

 Rogers. 



The rocks of Savage mountain are composed of the Mauch Chunk Red 

 Shales and Limestones (XI) and the overljang Conglomerate (XII), They 

 fold under the field with a dip of from 10' to 20', and rise up again in 

 Davis mountain, five miles beyond, with a reverse dip considerably 

 strengthened. There is a line of upthrow lying east of the basin, running 

 along the outlying red shale vallejs composed of the lower limestones, the 

 flint and the hard sandstones of X and IX (Pocono and Catskill). 



Wells' Creek mounlain at the northern end of the basiu, is flanked by 

 the uplifted Pocono sandstone and crowned bj^ the same, as it returns and 

 dips down the east flank, on ils way under the town of Cumberland. It 

 carries here on its back the overlying slates and flints, iron ore and lime 

 strata of XI. A range of little mounds dotted along between the basin and 

 this mountain range shows the harder limestones on edge. In Wells' 

 Pass, under the curve or anticlinal of the Pocono sandstone, is to be seen 

 the red sandstone of IX, though quickly returning. 



Knobby range, further to the south, towards Piedmont, probably carries 

 the Great White Sand (X), since at Keyser we find the lower limestones 

 of the red shales and the underlying flints upturning east of the town and 

 the New Creek ridge, and just west of the range. The Mauch Chunk 

 shales (XI) show on the Potomac, near Keyser, dipping 45° to the north- 

 west. 



The accompanying section has been made at different points on George's 

 creek, from Barton to Piedmont and ©n Potomac to Keyser. It includes 

 the Coal Measures, from a seam 400 feet below the Pittsburg Coal ; possibly 

 the Conglomerate Series ; the duplicate beds of red shale and limestones to 

 the Great White or Pocono sandstone. The intervein strata to the Great 

 Bed has already been published in Tyson Section, Plate VI, Report HHH.* 

 The Lower Barren group of coals are here distinctly shown with their 

 fossil limestones and sandstones, down to the Mahoning SS. Founded on 

 the existence of the underlying Ferrfferous limestone at Stony river. Prof. 

 J. P. Lesley some time ago identified the Upper Bloomington or six feet 

 coal of this basin as the lower Kittaniug seam. This is now proved by the 

 discovery of the fire-clay and limestones on the Baltimore and Ohio R. R., 

 and the lower iron and clay deposits to the Piedmont SS. 



The unveiling of the Conglomerate series of sandstones is important, 

 showing d total thickness of 560 feet, from the Piedmont sandstone down 

 to the lowest bed of coal. This series has its coal deposits through its en- 

 tire thickness, though not largely developed. But at least one workable 

 large seam has been noted, but has been omitted because of the uncertainty 

 of its proper position. 



* Report of Progress of Second Geological Survey of Pennsylvania, Somerset 

 county, by F. & W. C. Piatt. 



