i8o 



WORK OF THE OCEAN 



rocks"}, or even considerable islets are sometimes isolated by the 

 waves (Fig. 185). 



Waves may excavate caves at the bases of cliffs. The bottoms 



Fig. 184. High cliff, with beach; shore of Lake Michigan. (U. S. Geol. Surv.) 



Fig. 185. A chimney rock and an arch on the coast of France. (Neurdein.) 



