412 ABSTRACTS 



Devonian rocks which underlie the characteristic glade country about 

 Oakland, Mountain Lake Park, and Deer Park. West of Oakland is 

 another synclinal basin containing about 2500 feet of Carboniferous 

 beds. 



The geologic classification does not differ materially from that 

 outlined by W. B. Rogers and others, but geographic names have been 

 applied to all of the formations. The lowest members are a series of 

 sandstones and quartzites, which have been referred to as " No. IV " and 

 "Medina." This series has been subdivided into the Juniata forma- 

 tion, consisting of brownish red sandstones and shales ; the Tuscarora 

 quartzite ; and the Cacapon sandstones, consisting of thin-bedded red 

 sandstones. Next there is the representative Clinton formation, which 

 has been designated the Rockwood formation, as in other folios ; the 

 Lewiston. limestones, including representatives of the Helderberg 

 and associated limestones, and the Monterey sandstones, Romney 

 shales, Jennings formation and Hampshire formation, representing 

 the Devonian deposits. As the last three formations are not sharply 

 separated from each other, the patterns by which they are represented 

 on the map are merged in a narrow zone along their boundaries. The 

 Carboniferous period is represented by the Pocono sandstone; the 

 Greenbrier limestone; the Canaan formation, which in a general way 

 is a representative of the Mauch Chunk shales ; the Blackwater forma- 

 tion, which represents the Pottsville conglomerate in greater or less 

 part; the Savage formation and Bayard formation, which are the 

 Lower Coal Measures ; the Fairfax formation, or Lower Barren 

 Measures, and the Elk Garden formation, a part of the Upper Coal 

 Measures. 



The principal coal beds are in the Savage formation, containing 

 the "six-foot" or Davis coal bed; the Bayard formation, containing 

 the coal bed known as the "four-foot" or "three-foot," or "Bayard" 

 or "Thomas" coal; and the Elk Garden formation, containing the 

 "fourteen-foot" coal bed. 



On the economic sheet of this folio, the coal-bearing formations 

 are strongly emphasized, and underground contours are introduced 

 to show the lay of the "six-foot" coal bed in the Savage formation for 

 each 100 feet. Other economic resources of the area are red hematite 

 iron ores in thin beds in Rockwood shales and limestones at several 

 horizons, of which the lower member in the Lewiston is locally availa- 

 ble for cement. 



