52 



Yol. XLIIL. Art. C. — S. Tsuboi , 



Angular blocks which have fallen from the cliffs are gradually^ 

 rounckHl and reduced in size by the action of waves until at last 

 they become sands. Every stage of this course, from large angular 

 blocks to sands, is seen at different parts on the coast of the island. 

 Large angular blocks are found at the foot of every precipitous 

 cliff. Gravel beaches are found at several places, i.e., on the 

 coasts of Chigasaki'^ (la), of Nomashi'^ (Ic), of Okata'' (2a), etc., 

 while a sandy beach, developed by wave action, is seen on the 

 coast of Motomura*'' being called Yunoliama"'' (Ic). 



Besides the above, there are two sand beaches, a small one, 

 Gyojahama'-' (3c), on the east coast, and a more extensive one, 

 Sanohama'^ (le; Fig. 31), on the southwest coast. But these differ 



Fig. 32. Cave of GyOja on the east coast excavated by wave action. 

 The reck constiluting the cliflE is somma lava of the third type. (Fig. 1, 3c) 



from tlie above in their origin as they were not formed by the action 

 of the waves, but were developed by the accumulation of sands 

 blown down by the wind from the caldera through the north- 





3} 153 m 



4) TtH 



5) m^, 



