41*30' 



MEM. MUS. COMP. ZOOL. 



7 0° 57' 55 



GEOLOGY CAPE COD. PLATE 13 



70*27 



41*15 



I 30' 



EXPLANATION 





. 



Swamps (fresh) 



Marshes (salt) 



Beach and dune sand and gravel 



Falmouth moraine 



(Thin bouldery glacial drift overlying older 

 Pleistocene deposits, mostly sand and gravel) 



Nantucket moraine 

 (Corrugated moraine, mainly of folded pre- 

 Wisconsin clay, sand, gravel, and glacial- 

 till overlain by thin bouldery Wisconsin 

 drift) 



>- 

 rr 

 < 



z 



UJ 



F 

 < 



o 



Outwash sand and gravel correlated with 

 Nantucket moraine 



4115' 



70*57 



UAMS S HEIHTZ CO,WASH:,D C. 



70 27" 



Base from U. S. Geological Survey topographic 

 maps of Gay Head and Marthas Vineyard 

 quadrangles, reprinted from earlier 

 editions without revision 



GEOLOGIC MAP OF MARTHAS VINEYARD AND 

 OF PART OF ELIZABETH ISLANDS AND NO MANS LAND, MASS. 



Geology by J. B. Woodworth, 



U. S. Geological Survey, assisted by 



E. Wigglesworth and Gilbert Hart, 1915-1916 



Scale 62500 



5 Kilome bars 



Pre- Wisconsin Pleistocene deposits, includ- 

 ing folded and faulted glacial tills, boul- 

 ders, sand, gravel, and Gardiners clay 

 (marine) 



Older Pleistocene, Miocene, and Upper 

 Cretaceous deposits 

 (Includes folded and faulted glacial till, boul- 

 ders, sand, and gravel overlying Aquinnah 

 conglomerate (earliest Pleistocene); Miocene 

 greensand; Upper Cretaceous white clay 

 and gravel (partly marine?) and variegated 

 clays and lignite) 



\ >- 



rr 

 < >- 



DC < 



o 



CoTitour interval 20 feet. 



Dctttan. is mecirv s&a. level ■ 



