CONTINENTAL SHELF 



The sea-floor topography slopes gently from shore, past the tower, to 

 the edge of the continental shelf 6.5 miles from shore. At this point 

 the water is 330 feet deep. The break in slope of the sea floor at the 

 continental slope is gradual, as shown in this detailed PDR record. 

 Some outcrops occur on the outer shelf. 



CONTINENTAL 

 SLOPE 



LOMA 



SEA 



VALLEY 



DEPTH (FT) 

 



-120 



-240 



-360 



-480 



-600 



-720 



— 840 



960 



Proceeding west a distance of 4400 

 feet from the tower at a depth of 

 100 feet, there are sharp-crested 

 medium sand ripples 24 inches long 

 and 5 inches hi gh. 



Medium sand ripples give way 5300 

 feet out to 1-inch high rounded 

 ripples composed of fine sand. 

 Depth here is 128 feet. Organic 

 matter, forming a thin layer on the 

 surface, is again noticeable. 



Gradation of the fine sand ripples 

 into fine silt takes place 7000 feet 

 from the tower in water 164 deep. 

 The smooth bottom, pockmarked 

 with occasional small depressions, 

 is also mantled with organic de- 

 tritus. 



