SECT. 2] CONTINENTAL SHELF AND SLOPE 307 



efficient in slope evolution. Subaerial agents, including glaciers, have carved 

 valleys and troughs into the shelf. Tidal scour may have preserved these de- 

 pressions from being filled up with sediments, and may have carved some others 

 in weak rocks, but these factors do not explain the continental margin itself as a 

 distinct unit, ^^^arping. faulting and long-continued sedimentation are probably 

 the essential forces which have built this outstanding feature off the continents. 



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