PLATE 13 



Geologic map of Marthas Vineyard and of part of Elizabeth Islands and No Mans Land, Mass. 



Base from the United States Geological Survey topographic maps of Gay Head and Marthas Vine- 

 yard quadrangles. Geology by J. B. Woodworth, United States Geological Survey, assisted by E. 

 Wigglesworth and Gilbert Hart, 1915-1916. Drafting and editing under the supervision of the United 

 States Geological Survey. 





