356 



DYNAMICAL GEOLOGY. 



condition is nearly that just stated, the lower beds (11) being in contact 

 with the Devonian (VIII). In the former, III and V (Hudson River and 

 Clinton shales), of the flank of the anticline, are greatly thinned down (as 

 compared with the thickness on the other side of the flexure). To the 

 southwest the strata successively disappear until the condition in Fig. 330 



329. 



exists ; and then that in which II and XI, both great limestones, are in con- 

 tact. But, as they state, the ingulfed strata may, in some places along the 

 course, be found standing in isolated knobs between the two formations, 

 II and XI. The Professors Rogers observed, as reported by Lesley, that the 

 lines of faults of Virginia are continuous with flexures in Pennsylvania. 



Just beyond the cluster of great faults in the Appalachians comes the 

 high plateau, or table-land, characteristic of the northwest border of the 

 Appalachian Range. In East Tennessee it is called the Cumberland Table- 

 land; Fig. 331, by Safford, represents it with the height proportionally 



331. 



N. W. 



S. E. 



Cumberland Table-land, Tennessee; c, Crab Orchard Mountain; 2, Cambrian; 3, 4, Lower Silurian 

 (Calciferous and Trenton); 5, Upper Silurian; 7, Devonian (Black shale); 8, Subcarboniferous; 9, Coal 

 measures. Vertical scale 2000 feet = l inch; horizontal, 12 miles = 1 inch. 



much exaggerated. It is 2000 feet high, and 900 to 1200 above the Great 

 Valley of East Tennessee (the low eastern part in the figure), which is the 

 region of the great flexures and faults reduced to a valley by denudation. 



