ALLEGHENY AND CONEMAUGH IN ANTHRACITE FIELDS 225 



Clark. The "Baltimore" coal of the Wilkesbarre area is believed to be 

 the same bed; there it is often in two splits, the Bennett and Cooper, 

 which are mined separately. When united, the thickness averages 20 

 feet. It is single from Wilkesbarre to Ashley, but splits northeast from 

 the former place, the interval being 20 to 40 feet and the thickness of 

 coal 16 feet. It is always split west from South Wilkesbarre, with only 

 10 feet of coal and the splits about 50 feet apart. The interval to the 

 Red Ash is about 300 feet. The relations in the Nanticoke area are 

 uncertain. A bed found there at 90 to 140 feet above the Boss, and 

 known as the Twin, or Wanamie, is very near the place of the Baltimore ; 

 but it is so variable that some think it the equivalent of one of the thin 

 beds seen above the Ross farther north. Two higher beds have been 

 taken by some to be equivalents of the Bennett and Cooper splits of the 

 Baltimore, and the beds bear those names. The lower one is 50 to 100 

 feet above the Twin and the other is 30 to 40 feet higher. The lower 

 bed is mined at some places, 4 to 6 feet 6 inches thick, but the upper bed 

 is extremely variable and of little importance. In any event, whether 

 the equivalent of the Baltimore be the Twin or the higher beds, it is evi- 

 dent that the great bed has become insignificant in passing from Wilkes- 

 barre to the Nanticoke area. 



There seems to be a persistent coal horizon at 15 to 100 feet above 

 the Big, or Baltimore, bed; it is the Rock coal of the Jermyn-Priceville 

 area, traceable thence into the Pittston area, where it is known as the 

 Checker. It becomes important here and there, varies from 6 to 10 feet, 

 and generally yields rather poor coal. 



In the Jermyn-Priceville area the sections show three coal beds above 

 the Rock within a vertical space of about 200 feet ; these are the Diamond, 

 Olyphant 2 and 1. They yield good coal, but are rather thin. They 

 have been recognized in the Scranton region, showing the same features. 

 In the Pittston area a coal bed, the Hillman, is at an average distance of 

 175 feet above the Checker, 6 to 8 feet thick, and preserved in only a 

 small space. A coal bed known as the Hillman occurs in the Wilkes- 

 barre area at an average distance of 270 feet above the Baltimore bed, 

 and is from 7 to 10 feet thick, with much clean coal. As the areas of the 

 higher beds are very small near Pittston and Wilkesbarre, it is difficult 

 to make correlation; but the Hillman of both Pittston and Wilkesbarre 

 seems to be one bed and very near the place of Olyphant 2. A Hillman, 

 coal is in the Nanticoke region at 240 feet above the Twin coal. It is 

 very near the place of the Wilkesbarre Hillman, if the Twin be taken as 

 the Baltimore. 



XVIII— Bull. Geol. Soc. Am., Vol. 17. 1905 



