502 



SHEPARD 



[CHAP. 20 



along the northern Cahfornia coast, which looks hke a river-canyon type, has 

 actually been cut off, although the cut took place at the present coast (Fig. 16). 

 Delgada Canyon is along a northward continuation of the fault at Shelter Cove 

 where a horizontal shift occurred at the time of the San Francisco earthquake ; 

 therefore it may be a part of the San Andreas fault system (Shepard and 



la^ooQ' 



124° 08' 



124° 07' 



124° 09 



DELGADA CANYON 

 P 1000 2000 3000 4000 5000 



Scale in feet 

 Sounding in fathoms 

 Lond and sea floor contour interval - 25 fathoms (150 feet) 



124" 07' 



Fig. 16. Escarpment at the head of Delgada Canyon with a 45° slope which appears to 

 have been produced by the cutting off of the canyon by movement along the San 

 Andreas Fault. Note that the submarine canyon head does not coincide with the land 

 canyon. 



Emery, 1941, p. 39). The cutting of the canyon by such faulting is thoroughly 

 understandable. The large right lateral movement along the San Andi'eas fault 

 elsewhere would certainly result in developing the scarp at the canyon head and 

 shifting the canyon along the coast out of line with the land canyons. It is 



