PALEOZOIC ROCKS OF THE CANTON QUADRANGLE 



23 



rest directly upon the crystallines in the more northerly outliers, 

 whereas southward the outliers become mostly red beds, at least 

 75 feet in thickness at locality 80 and 150 feet at Frank Crary's 



Bucks Bridcje 



Heuue/tc 



^ I / ' 



T—'o i s c/ c 



No 2 



J / J /reccirrtbncin 



Fig. 4 Cross sections showing variant possibilities as to the presence or 

 absence of the Potsdam beds within tlie concealed zone south of Morky. 

 No. I is a portion of figure B — B of the colored sections, with the Pots- 

 dam " lapped out " by the' Theresa beds. No. 2 shows the alternative 

 mapped in figure 3. No. 3 represents an intermediate interpretation. 

 (Scale is one and one-fourth times that of the colored map.) 



(locality 84'), with the summit and white beds removed by erosion. 

 Evidently the sub-Potsdam floor was higher at the north than at 

 the south when they were laid down, and it is believable that its 

 summits were not wholly buried under the accumulating sediments 

 before Theresa time ; in which case the presence or absence today 



