NO. 1 



EMEKV AND UL'LSEMANN: SlBMAKINt; CANYONS 



53 



TABLE : 



Capitella Bottoms in Canyons 

 (from Hartman, 1%J) 



Can^•on 



Sample 

 Number 



Depth 

 (m) 



Number of 

 Specimens* 



Hueneme 



Mugu 



Santa Monica 



Redondo 



Ne'ivport 



La Jolla 



•Sampler covers an area of 0.6 square meters of ocean floor. 



SEDIMENTS 

 Sampling Methods 

 This study is based entirely upon surface samples, though cores were 

 used in some previous work by Gorsline and Emery ( 1959) in a few- 

 submarine canyons. More than 90 per cent of the samples were taken 

 with a large clam-shell bucket which covers an area of 0.6 square meter 

 and encloses as much as 0.18 cubic meter of mud; these samples were 

 taken primarily for the biological work to be described by Hartman. 

 Most are the result of attempts to sample the axes of the canyons using 

 the same procedure as that for positioning water-sampling stations. Be- 

 cause of ship drift, however, some of the attempts missed the axes and 

 these samples are from the steep side slopes of the canyons. About 10 

 per cent of the samples were obtained with a small snapper having a 

 volume of about 500 cc. Some snapper samples are from water-sampling 

 stations, but others are independent samples designed to learn the na- 

 ture of sediments on the walls of the canyons. Of a total of 211 samples, 



