SWANTON] INDIANS OF THE SOUTHEASTEIRN UNITED STATES 



4. Valley and Ridge b, Middle section 4b, The same, but even- 



province crested ridges predomi- 



nate over valleys except 

 on east side. 



c, Hudson Valley 4c, Glaciated peneplain on 



weak folded strata. 



5. Appalachian Pla- a, Mohawk section 5a, Maturely dissected glaci- 



teaus. ated plateau; varied 



relief and diverse alti- 

 tudes. 



b, Catskill section 5b, Maturely dissected pla- 



teau of mountainous re- 

 lief and coarse texture 

 (glaciated) . 



c, Southern New York 5c, Mature glaciated plateau 



section. of moderate relief. 



d, Allegheny Mountain 5d, Mature plateau of strong 



section. relief; some mountains 



due to erosion of open 

 folds. 



e, Kanawha section 5e, Mature plateau of fine 



texture ; moderate to 

 strong relief. 



f, Cumberland Plateau 5f, Submaturely dissected 



section. plateau of moderate to 



strong relief. 



g, Cumberland Mountain 5g, Higher mature plateau 



section. and mountain ridges on 



eroded open folds. 



6. Interior Low Pla- a, Highland Rim section. 6a, Young to mature plateau 



teaus. of moderate relief. 



b, Lexington Plain 6b, Mature to old plain on 



weak rocks ; trenched by 

 main rivers. 



c, Nashville Basin 6c, Mature to old plain on 



weak rocks; slightly up- 

 lifted and moderately 

 dissected. 



d, Possible western sec- 6d, Low, maturely dissected 



tion (not delimited). plateau with silt-filled 



valleys. 



7. Central Lowland. . a, Eastern Lake section 7a, Maturely dissected and 



glaciated cuestas and 

 lowlands; moraines, 

 lakes, and lacustrine 

 plains. 



b, Western Lake section.. 7b, Young glaciated plain; 



moraines, lakes, and 

 lacustrine plains. 



c, Wisconsin Driftless 7c, Maturely dissected pla- 



section. teau and lowland in- 



vaded by glacial out- 

 wash. (Margin of old 

 drift included.) 

 464735—46 2 



