508 



F. P. GULLlVEb— NANTtCkET SHORELINE^ 



to form these great sand spits, which threaten to close the entrance of the 

 inland waterway on the eastern coast of the United States through Nan- 

 tucket and Vineyard sounds. This danger was pointed out by Professor 

 Henry Mitchell * who says : 



" It looks as if the sea would soon break from Monomoy to Nantucket on the 

 summit of the circus that is formed by Pollock Rip, Great Round Shoal, and Great 

 Point Rip, with their connections." 



Cape Cod 



41* 30 



70° oo 



Nantucket 







4I° 3Q 



:;.•:«•.■*• 



Sound 



Marthas 



VlNEYARO 



Great point 





COSC ATA 



H aulover Break 



Mhkts 



til a 3 4 s t, Tr-B *' io 



i?i i t f > „f r \ t t. t , 



Smith Poiny-.. 



Maooaket 



K l LC METRES 

 ci s io IS 



Li I I.J ) l,„t \A.\ I t 



MlAC 6 Vl ET 



For eland 



10' 



00 



Figure 1. — Nantucket and adjneent Areas. 



In 1887 Professor Mitchell began to study the movements of sand 

 along the shoals off Great point and Monomoy .f He based his work on 

 his studies of the tidal movements in New York harbor, and compared 

 the circus of shoals outside of the Monomoy entrance to the New York 

 deposits, and says : 



" We have at the entrance to the Vineyard sound, at least in embryo, the out- 

 side and inside bars of an 'inlet' (as an opening through the sandy cordon of our 



* A report on Monomoy and its shoals. U. S. Coast and Geodetic Survey. Appendix no. 8, 1886. 

 fThe movements of the sands at the eastern entrance to Vineyard sound. Appendix no. 6, 

 1887. 



