STRATIGRAPHY 633 



ton sand, not yet penetrated, is expected at 8,000 to 8,500 feet, while the 

 Trenton limestone lies at 9,500 to 10,000 feet from the surface. 



A list of the oil sands of the Pennsylvania-West Virginia district, as 

 compiled from various publications, is given in the following table : 



Oil Horizons of Pennsylvania-West Virginia District 



<-<„-„K^,,i-p^-„^„c Distance above (■ 4- ) 



Carboniferous. or below (— ) the 



Pennsylvanian. ^'"In7e?t ''''^^ 



Monongaliela formation (Upper Productive measures). 



Carrol sand (Uniontown sandstone), productive in West 



Virginia only + 300 



(Pittsburgh Coal horizon) 



Conemaugh formation (Lower Barren measures). 



Murphy, Shallow, Little Dunkard, or First Cow Run sand 



( Saltsburg sandstone) — 200 



Big Dunkard or Cow Run sand (Mahoning sandstone) . . — 500 



Allegheny formation (Lower Productive measures). 



Second Cow Run sand (Freeport sandstone) — 600 



Gas sand — 800 



Pottsville formation (Salt sand). 



Johnson Run sand (Homewood sandstone) — 900 



LTpper Salt sand (Lower Conoquenessing sandstone) — 950 



Middle Salt sand (Lower Conoquenessing sandstone) .... — 1050 



Lower salt (Sharon conglomerate) — 1150 



Mississippian. 



Mauch Chunk formation. 



Maxton or Cairo sand (of West Virginia) — 1200 



Greenbrier limestone ("Big Lime") — 1250 



Pocono formation (Big Injun sand). 



Keener sand — 1300 



First, Second, and Third Pay sands (Top) — 1400 



Squaw sand — 1450 



Wier sand —1500 



Devonian. 



Catskill formation. 



Upper Gas sand (sometimes placed in Pocono) — 1550 



Berea or Thirty-foot sand (sometimes placed in Pocono) . — 1750 



Murraysville or Butler sand — 1800 



Gantz, First, or Hundred-foot sand — 1850 



Fifty-foot sand —1900 



Ninevah, Thirty-foot, or Second sand — 2000 



Gray, Gordon Stray, or Boulder sand — 2100 



Gordon, Third, or Campbells Run ( ?) sand —2150 



Fourth sand (Gordon of West Virginia?) —2200 



Fifth sand (McDonald of West Virginia?) —2250 



Bayard sand —2400 



