BEACH CUSPS 



245 



Some at once went on down into the bay alongside, whence 

 they were finally removed seaward by the play of ordinary waves. 

 Of a hundred stones flung into one of the bays, more than half 

 were carried seaward in twenty minutes, and the others were half 

 buried in the gravel by the scouring water digging pits in front 

 of them. On another occasion my hat blew into the water in 

 one of the bays, and in spite of some wind off-shore, was soon 

 cast up on one of the promontories. There is some travel of 



Fig. 5. — Delta Cusps and pebble fringe. 



material shoreward up the promontories and much travel down 

 the bays toward the sea. The great wave drives a good deal of 

 material on shore. 



The cobbles that descend over the fan deltas to the beach 

 margin, and again ascend the promontories at the next high 

 water, do not necessarily return to the point in the stony belt 

 above from which they descended. It is probable that with 

 winds setting more or less obliquely along a beach the descents 

 will be made constantly to the right or left of the descents. I 

 think I have seen something of the sort on Lynn Beach, but the 

 observations were not sufficiently continuous to make this cer- 

 tain. In this case each cobble is liable to travel epicycling along 



