35 



submerged fan off the terminal end of Redondo Canyon, and 

 the profiles shown in Figure 9 confirm that a fan is present. 

 However, there are not enovigh soundings off Santa Monica 

 Canyon to determine the nature of its terminal end. 



APPARATUS AND METHODS 



Prior to collecting bottom samples in Santa Monica Bay, 

 U. S. Coast and Geodetic Survey "smooth sheets" and Shepard 

 and MacDonald's (1938) report were closely examined. Areas 

 where rock and gravel had previously been reported were 

 examined by rock dredges (Fig. 10~£) and in areas where the 

 type of bottom material was unknown or in doubt, an underway 

 sampler (Fig. 10-C) was used. Additional information regarding 

 the bottom character was obtained by the use of a shallow-water 

 recording fathometer, when it was found that extensive patches 

 of rock and sometimes gravel areas could be observed on fatho- 

 grams. After the general locations of rock, gravel, and the 

 finer sediments had been delineated, a snapper sampler (Fig, 

 10-D) or an Hayward grab sampler (Fig. 10-A) were used for the 

 collection of larger unwashed samples. In areas where the 

 vertical distribution of sediments was of importance, cores 

 (Fig, 10-B), jettings, and samples by divers were obtained. 

 Samples obtained by divers were limited to water less than 

 150 feet, 



A preliminary determination of bedrock was accomplished 

 mainly on the basis of the "feel" of the cable as the dredge 

 was slowly towed across the bottom. Further criteria used 

 in recognizing bedrock included the freshly fractured aspect 



