WHITE.] THICKNESS OF POTTSVILLE IN SOUTHERN FIELD. 



859 



Nesquehoning Gap, (*) 1,150 feet, or 910 feet from the A coal; Laus- 

 ford railroad tunnel, (*) 075 feet from the A coal, or 780 feet from the 

 B coal; Sharp Mountain Gap, (*) Tamaqiia, 850it feet; Locust Moun- 

 tain Gap, Tamaqua, 750 feet from the A coal, or 880 feet from the B 

 coal, accord! no- to the statement of Mr. Ashburner;^ Potts ville Gap, 

 1,195 feet; Westwood Gap, 1,105 feet; Broad Mountain, in the region 

 of Altamont collier}^ No. 2,(*) 1,210 feet from the horizon, which would 

 seem to be referable to, and is, at least, probabh" not lower than, the 

 Buck Mountain bed to the red shale; Swatara Gap," 1,025± feet; 

 Rausch Gap, Schuyliiill Count}', l,205=t: feet; Lincoln region, (*) 1,110 

 feet; Black Spring Gap, l,lob± feet; Gold Mine Gap, 1,130± feet; 

 Rausch Gap, Lebanon County, l,105=t feet; Rattling Run, (*) 1,100 

 feet; Kohlers Gap, (*) 1,219 feet; Williamstown, (*) 1,100 (?) feet. 



Since a number of the localities cited are either common to two or 

 more of the preceding lists, or are so near as to leave little room for 

 actual important variation, the measurements at these points may be 

 combined in a table, which will show the thickness of the Pottsville 

 formation as measured, iirst, by Rogers; second, by the second geolog- 

 ical survey of Pennsylvania, an arbitrary lower limit being used; and, 

 third, as either measured or compiled by me, the topmost bed of red 

 shale being taken as the lower limit of the Pottsville formation. 



Measuremi'iiU oftlie. Pottsville fonnaiioii in the Soutltern Anthracite field. 



Location of section. 



803 

 1,030: 



Neyquehoning Gap 792 



Lansford railroad tunnel 



Locust Gap, Tama(]ua 



Sharp Mountain CJap, Tamaqua . . 



Pottsville Gap 



Wcstwood Gap 



Broad ]Mountain, near Altamont '2 



Swatara Gaj) 



RauHch (^•A\i, Scluiylkill County .. 



Linc'oln-Kalmia 



Black Spring Gap j 



Gold Mine Ga]) j 



Kohlers Gai > : 230 



Rausch (iap, Lebanon ( ounty 



Williamstown 



I 

 Rattling Run 



Measured by- 



Rogers. Smith. 



1,155 

 878 

 1,296 

 1,130 

 1,350 



1,200 

 1,100 



to 

 1,200 

 1,475 



1,400± 

 1,100 



White. 



940 A (1,150B) 



690 A (802 B) 



750 A (952 B) 



850=fc 



] , 195 



1,165 



b210± 



1,025± 



1,205± 



1,110± 



1,160± 



1,130-:: 



1,219 



l,165d: 



, 1,460? 

 1,100 



1 Second Geo!. Survey Pennsylvuniii, Anthracite Region, Rept. 1, 18S3, p. 80. 

 • Perhaps not over 9.50 feet. 



