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Figure 101, 



Southack's 1717 map of Cape Cod (courtesy of Harvard 

 Museum of Comparative Zoology) (from Goldsmith, 1972) 



take place until a storm in 1869 created a larger permanent inlet through 

 the barrier (Mitchell, 1873). By 1851 North Beach had begun its third inlet 

 migration cycle in recorded history. At this time, the passage between 

 Pleasant Bay and Nauset Harbor was closed except at very high tides (Freeman, 

 1858). 



In 1871 Henry Mitchell of the U.S. Coast Survey was assigned to document 

 the rates of erosion of the barrier spit protecting Chatham. From measure- 

 ments taken between 1847 and 1872, Mitchell calculated a loss of 129 hectares 

 and as much as 305 meters from North Beach (Mitchell, 1873). The shoreline 



163 



/- 



V 



