GEOLOGY AND STRUCTURE 



529 



which are here overlain by cherty Knox dolomite thrust over the Silurian 

 from the east and forming the cap of Missionary Eidge. 



So 



Structure 



The strata of the Chat- 

 t a n o o g a - Missionary 

 Ridge area have been 

 faulted and folded in a 

 manner similar to that 

 of the Appalachian re- 

 gion, and such folding 

 and faulting has been 

 given the name of Ap- 

 palachian structure. 



A cross-section of the 

 geology, as it occurs on 

 a line extending in a 

 roughly west-east direc- 

 tion from Bragg's quarry, 

 in East Chattanooga, 

 across the crest of Mis- 

 sionary Ridge and on to- 

 ward the White Oak 

 Mountain, shows the 

 Lowville formation con- 

 taining the 40 -inch layer 

 of bentonite, dipping 

 slightly to the southeast 

 under Missionary Ridge. 

 A study of this section 

 shows that the rocks have 

 varying dips of from 2 

 to 30 degrees, all to the 

 southeast, and that the 

 strata dip under the west 

 side of the ridge. The 

 strata quickly turn up- 

 ward as they near the 

 line of the thrust-fault 

 and form a closely com- 

 pressed synclinal fold 

 overturned toward the 

 west. 



XXXV — Bull. Geol. Soc. A.m., Vol. 34. 1922 



7e.nne,S5e.e- /?/Ve/' /<^m/ i^est 

 of querry 



ElfiLSt ChSLttxaLnooga. 



Bauxite Mine 



Z 



en 

 CO 

 O 

 Z 

 > 

 X) 

 < 



2 

 a 

 o 

 n 





