GULLIVER. — SHORELINE TOPOGRAPHY. 



215 



On the inside of the cusp there is a faint cliff where the coast was nipped 

 after the initial drowning. The central lagoon is nearly all converted 



k--"-'^ 





Figure 23. Filled Stage of Tidal Cuspate Foreland : West Point. Washington. 



into marsh, a small tidal inlet remaining on the left side with a few small 

 ramifying branches. The cusp is very perfectly formed by the intersec- 

 tion of the two curves in a sharp point. 



Sand point in Narragansett bay is nearly as typical in form and 

 position as West point. This point projects from the eastern side of 

 Prudence island (C. S., 353) into a channel less than two miles broad 

 and from 10 to 17 fathoms deep, 5.^ fathoms off the point of the foreland. 

 This cusp is smaller than the average tidal cusp, and it shows no included 

 Isgoon or marsh. Mr. J. B. Woodworth says that the ice in winter 

 overrides this cusp, and thus any indications of embryonic form would be 

 obliterated. The secondary cusp on the left side of the foreland appears 

 to be due to the collection of sand about rocks or piles driven into the 

 sand. 



A profile has been drawn from another typical cusp, point Wilson 

 (C. S., 6405), north of Port Townsend, Washington. This drawing (Fig- 

 ure 24) shows the relation of the foreland to the older mainland. The 

 broken line indicates the probable initial form of the land following the 

 depression which inaugurated the present cycle of shore development. 

 The " foreland" quality of the cusp is here clearly seen ; it is constructed 



