EFFECT OF SEA BARRIERS UPON DRAINAGE 447 
streams emptying into Albemarle, Pamlico, and neighboring 
sounds. The drainage in all these localities is deflected many 
miles. Many less marked instances of deflected streams may be 
seen upon almost any map of a long coast line. 
The writer’s attention has been called by Dr. J. C. Branner 
to the stone reefs along the coast of Brazil. These reefs bear 
Fic. 2 Fic. 3 
Fic. 2 shows a shore line whose drainage is deflected by a barrier. The cross- 
section shows the relations existing between the barrier, lagoon, new, and older strata. 
Fic. 3 shows the arrangement of drainage, as represented in Fig. 2, after the 
elevation of the land. The “lagoon portion” of the stream is here shown as being 
directly along the contact between the newer and older groups of strata. 
the same relation to the shore as ordinary sand barriers, and they 
are probably old barriers whose sands early became cemented. 
In such cases of early solidification, the ‘‘lagoon”’ portion of 
the resulting land stream is, of course, held in position much 
more firmly than in the case of loose sands. 
