SHALLOWS OF THE COAST. 



181 



CHAPTER XXI. 



SHALLOWS OF THE COAST. — DEPOSIT FROM CALCAREOUS ROCKS. —APPEARANCE 

 OP STRANDS AND BEACHES. 



The formation of shallows and sand-banks is connected also with 

 that of littoral ridges ; they are developed parallel to the shore, 

 under the combined influence of the currents along the coast and 

 winds from the open sea. A glance at a chart which indicates 

 the form of those ramparts hidden under the waves, shows at once 

 that all these invisible banks of sand and mud tend to elongate 



Fig. 81.- Road of La Madeleine, California. 



themselves in a straight line, or to follow graceful curves no less 



