422 CHARLES S. PROSSER 



argillaceous shales which both laterally and vertically merge 

 gradually into each other and in the upper part of the formation 

 shales, some of which are gray, and some brown in color, 

 predominate. Some of the sandstones are crossbedded, and in 

 the lower part of the formation, massive. The thickness varies 

 from 1900 to 2000 feet. Fossils occur very infrequently. The 

 formation is named from Hampshire county in northeastern 

 West Virginia, a considerable area of which is underlain by it, 

 and it represents at least part of the Catskill formation of New 

 York, or No. IX of Pennsylvania. 



CARBONIFEROUS STRATA 



Pocono sandstone — The most eastern area of this formation, 

 which forms the upper part of Town Hill, is mainly a massive 

 conglomerate, while in the western area, extending across the 

 county from Pennsylvania to West Virginia along the eastern 

 face of Alleghany Front, the lower part of the formation is a 

 coarse-grained, grayish-green, micaceous sandstone. Near the 

 middle are shales containing fragments of plants, and the upper 

 part is a grayish-green or reddish-green, micaceous, flaggy sand- 

 stone with some interbedded shales of various colors. Some of 

 the layers are cross bedded and others are conglomeratic. The 

 thickness varies from 400 to 450 feet, and fragments of plants 

 are the only fossils noted with the exception of a few shells 

 apparently from this formation which were found nine miles 

 northeast of Oakland, Garrett county. The formation is named 

 from Pocono plateau in northeastern Pennsylvania, and is No. 

 X of the Pennsylvania reports. 



Greenbrier limesto?ie. — This formation crosses the county as a 

 narrow band along the eastern face of the Alleghany Front from 

 Pennsylvania to West Virginia. The best exposures are in Jen- 

 nings Run above the railroad water-tank ; and on the north bank 

 of the Potomac River below the mouth of Stony Run, as well as 

 in the lower part of the run, two miles below Westernport. The 

 lower part of the formation is composed largely of bluish-gray, 

 arenaceous limestone, the middle of red and olive shales and the 



