ALLEGHENY AND CONEMAUGH IN ANTHRACITE FIELDS 223 



Wilkesbarre and ISFanticoke, there remains a thickness of about 1,800 

 feet. The lower coal beds seem to be fairly recognizable in the several 

 basins, but much doubt exists respecting the higher beds. Even in the 

 lower beds identifications must be made with hesitation at times, as the 

 beds in splitting become thin and continuous workings are not possible. 

 The succession and probably synonymy are as follows, descending : 



Auble coal bed, 



Snake coal bed, 



Abbott coal bed, 



Kidney coal bed, 



Olyphant coal bed I, Brisbin, 



Olypliant coal bed II, Richmond, Hillman (?) 



Diamond coal bed, 



Rock coal bed, Checker, 



Pittston coal bed, Grassy island, Slope, Big, Baltimore, 



Marcy coal bed, New County, Fonr-foot, Ross, 



Shaft coal bed, Archbold, Clark, Four-foot, 



Dunmore coal bed III, Clifford, 



Dunmore coal bed II, 



Dunmore coal bed I, 



The Dunmore coal beds are subject to great variation in the northern 

 part of the field; six beds are shown in a vertical distance of 136 feet at 

 Carbondale, of which one is workable, but farther north, at Forest City, 

 all are thin. The interval from the Shaft coal bed to the top of the 

 Pottsville, near Carbondale, is 125 feet, but at Forest City it is ISO. 

 Still farther southwest, near Priceville, Olyphant, and Blakely, the Dun- 

 more beds are all thin, but at one locality on the northerly side they seem 

 to have united into one bed with 14 feet of good coal, and. the interval 

 from Clark (Shaft) coal to Pottsville has increased to 260 feet. Toward 

 Scranton three Dunmore beds are worked at 202 feet below the Clark 

 (Shaft) coal, with a total of 16 feet of coal and partings in a vertical 

 space of 32 feet ; but these intervals are unusually small, as the Dunmore 

 beds are distributed ordinarily in a vertical space of about 100 feet and 

 highest one is from 170 to 35 feet below the Clark, this interval decreas- 

 ing southwestwardly. In the Pittston area the Dunmore beds are repre- 

 sented by the Eed Ash, or PoAvder Mill, coal bed, which is usually triple in 

 the northeastern portion, the intervals between the splits varying from a 

 few inches to 60 or 70 feet, though where the bed is double the interval 

 rarely exceeds 20 feet. In the western portion the bed is usually double, 

 with the splits, 5 and 4 feet, about 25 feet apart; but in the Boston col- 

 liery they are united with a thickness of 10 to 12 feet. In the eastern 

 portion of this area the Clark is 80 feet above the top split, but in the 



