440 



E. O. ULRICH REVISION OP THE PALEOZOIC SYSTEMS 



which directly transmit the thrust. Section 6 shows the stage supposed 

 to have been reached at the close of the Tertiary, before which time it is 

 thought the movements locally effected complete burial of certain Ap- 



.Appaiachia;^ ^'""^ ^''"^- 



Valle^y I /-^ Piedmont 



Figure 16. — Inland Migration of Belts of Folding in Southeastern North America 



