STRATIGEAPHY 573 



beds^ which discriminate it from the Allegheny, and of marine lime- 

 stones, which separate it from the Monongahela formation. Its numer- 

 ous coal seams are also more lenticular and less persistent than those of 

 the formations mentioned. 



The Conemaugh formation attains a thickness of 900 feet in the 

 Georges Creek Valley. 



Members. — It contains the following members in descending order: 



Morantown coal — split from base of Pittsburgh coal. 



Upper Pittsburgh limestone. 



T.ower Pittsburgh standstone. 



Little Pittsburgh coal. 



Lower Pittsburgh limestone. 



Second Little Pittsburgh coal. 



Connelsville sandstone.. 



Franklin rider coal. 



Franklin coal ("Dirty Nine-foot" coal). 



Lonaconing sandstone. 



Upper and Lower benches of Lonaconing coal. 



Hoffman sandstone. 



Upper and Middle Hoffman coals, 



Hoffman limestone. 



Lower Hoffman coal. 



Clarysville sandstone. 



Upper bench of Clarksburg limestone. 



Upper and Lower Clarysville coals. 



Lower bench of Clarksburg limestone. ? 



Morgantown sandstone— massive, locally conglomeratic. 



Wellersburg rider coal. 



Wellersburg coal — Twin coal. 



Barton rider coal. 



Barton sandstone. 



Barton coal (*'Elk Lick" coal). 



Barton limestone. 



Upper Grafton sandstone — massive. 



Federal Hill coal. 



Lower Grafton sandstone. 



Upper Ames limestone and fauna. 



Harlem rider coal. 



Lower Ames limestone, shale, and fauna. 



Harlem coal. 



Ewing limestone." 



Pittsburgh red shale. 



Saltsburg sandstone — massive, locally conglomeratic. 



« This is called the Ewing limestone in the reports of the West Virginia Geological 

 Survey. According to Condit (Bull. 17, Ohio Geol. Survey, 1912, p. 37), the true Ewing 

 limestone lies helotv the Pittsburgh red shale. 



