BULL. GEOL. SOC. AM. 



VOL. 21, 1909, PL. 41 



Figure 1. — Sand Beach Cusps ox Westquage Beach^ Rhode Island 

 Photograph hy Sharpies for the U. S. Geological Survey 



Figure 2. — Cobblestone Beach Cusps on Winthrop Beach^ Massachusetts 

 The cusps are partially eroded. Smaller cusps more closely spaced are forming at water' 



BEACH CUSPS 



