SOUTHERN AND CENTRAL APPALACHIANS 



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Fig. 8.18. Section in the folded and thrust-faulted Appalachians of west-central Virginia, after Butts et a/., 

 1933. Section 14 runs through Lexington and Section 16 from the West Virginia line to Waynesboro and 

 Afton. See index map, Fig. 7.1. 



northwest side of the mountains it is overlain by the Cochran formation, or basal 

 unit of the Chilhowee group, which is of Cambrian and Precambrian (?) age. 

 South of the mountains it is overlain by rocks of the Murphy marble belt; here, 

 the top of the Ocoee is placed tentatively at the base of the Nantahala slate. 

 The Ocoee series is divisible into three broad units of regional extent and 

 contrasting lithologic character, which are herewith designated groups and 

 named the Snowbird group, the Great Smoky group, and the Walden Creek 

 group. The groups consist of local intergrading and intertonguing formations 

 and have complex stratigraphic and structural relations. The Ocoee series is 

 split by major thrust faults into three sequences, a southern, central, and 

 northern, none of which contains more than two groups of the series (King 

 etal.,1958). 



The west front of the Great Smokies and the Blue Ridge belt south- 

 westwardly is characterized by great folded thrusts, described in part 

 under the previous Valley and Ridge province. Where the overridden 

 rocks are exposed as re-entrants or windows and composed of limestone 

 or dolomite, they form "coves" or valleys lying within the mountains of 



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Fig. 8.19. Sections in the folded and thrust-faulted Appalachians of Virginia. After Butts et at., 

 1933. Section 17 is about 10 miles north of Staunton, and Section 18 is 10 miles north of 

 Shenandoah Caverns. See index map, Fig. 7.1. 



