
278 - DYNAMICAL GEOLOGY. © [Boox IIT. — 
constantly grinding down sand and gravel, mingling with them the — ; 
remains of shells and other organisms, sometimes piling the deposits 
up, sometimes sweeping them away out into opener water, forms a 




























































































































































































































































Kia. 67.— View oF A LINE OF ANCIENT SEA-CLIFF PIERCED AT THE BASE WITH SEA- 
WORN CAVES AND FRONTED BY A RAISED BEACH, 
familiar terrace or platform on coast-lines skirting tidal seas. When 
land is upraised, and this margin of littoral deposits is carried 
above the reach of the waves, the flat terrace thus elevated is known 
as a “raised beach” (Figs. 67, 68). The former high-water mark 
then lies inland, and while its sea-worn caves are in time hung with 
ferns and mosses, the beach across which the tides once flowed 
furnishes a platform, on which meadows, fields, gardens, roads, 
houses, villages, and towns spring up, while a new beach is made ~ 
below the margin of the uplifted one, 3 

Fie. 68.—Sxorion or A Ratsep Bracu, Composep or GRAvEL AnD SAND (b ¢ da) 
RESTING ON UPTURNED SLATES (a), FiInstRALL Bay, CornwALuL (B). 
Raised beaches abound in the higher latitudes of the northern 
and southern hemispheres. They are found, for example, round 
many parts of the coast lime of Britain. De la Beche gives the 

