540 CHARLES H. CLAPP 
older and presumably harder rocks on which the coastal plain 
deposits were laid down. There are, however, no mapped, good 
and clear examples of such a shoreline, although much of the 
Pacific shoreline of North America from Vancouver Island south, 
may be of this character, since even where the shoreline is cut almost 
entirely in hard rocks, there are remnant patches of coastal plain 
deposits; while between the stretches of rocky shoreline are long 
Fic. 3.—Contraposed shoreline, showing hard rocks overlain by retrograded soft 
mantle. Shore south of Victoria, British Columbia. 
reaches of mature shoreline cut in extensive coastal plain deposits. 
The development of the Pacific Coast shoreline has, however, been 
complex, while the development of an ideal contraposed shoreline is 
simple, taking place during a single cycle, during which there is, of 
course, a still stand of the land. But on a relatively small scale, 
contraposed shorelines are so very frequent in occurrence and so 
strongly marked and easily recognized, that some generally accepted 
term for them will be a great convenience. 
