RUSSELL FORK FAULT OF SOUTHWEST VIRGINIA 363 
the shearing by which the block to the east moved several miles 
to the northwest. The writer does not believe that there was 
in the original stress any distinct southwesterly component, but 
Fic. 6.—Slickensided shale near mouth of Lick Creek south of Birchleaf 
considers the Jacksboro thrust to be solely the result of the twisting 
of the block. 
The Pine Mountain fault is compound at C, consisting of 
four distinct overthrusts, but becomes more simple northeastward. 
The faulting which commenced at the southwest developed pro- 
gressively toward D as the stress continued, but naturally the 
