PENEPLAINS OF DRIFTLESS AREA 



125 



A ( ORRELATION OF THE PENEPLAINS OF THE DRIFT- 

 LESS AREA. 



URBAN B. HUGHES. 



The conclusions reached in this paper in regard to the erosion- 

 al history of the Drif tless Area are the results of evidence secured 

 from three sources : (1) Field work during the summer of 1915, 

 carried on by the writer in the Baraboo district and the Rich- 

 land Center quadrangle, Wisconsin, has furnished direct evidence 

 for the northern portion of the area under consideration. (2) 

 The literature on the subject has been used freely, the Lancaster- 



Hershey 

 Lreraceous Plain 

 Ternary Plain 



Celrin 



Mlamakee P/-/J00 

 JrOHirUje rW,Uiain^ 



Plain No 1 - /300' 

 Plam No 2 -1/00 



Leonard 

 Lvner Plain- ia 



ei/j/as P lain ■ 1^o' 



Trowbndae rW<llia//r± 

 Pii'n Ma 7 - / 2.00' 

 Pimjit /!/*.£. - <feo' 



t> Niagara PIqi., ,,?,-,t,** 

 Galena Pla 1 n- tvs> foot 



Fig. 10 — A sketch map of the southern half of the Driftless Area, show- 

 ing where and by whom work has been done on the upland plains and 

 the general conclusions reached by the various workers. 



Mineral Point folio by Grant and Burchard having proven espec- 

 ially valuable. (3) The details of the Elizabeth and Galena 

 quadrangles were furnished by Prof. A. C. Trowbridge under 



