F-20 

 One sample of white marl was recovered on the ski of the camera 

 sled. This yielded an age of mid Eocene. 



The carbonate concentration in sediments recovered is gen- 

 erally quite low with values ranging from 0.8% to 7.6%. 

 The carbonate component is comprised primarily of biogenic 

 material (foraminifera, coccoliths, and shell fragments) 

 with some detrital carbonate. 

 Current Velocity Measurements 



Submarine canyons have long been recognized as the conduits 

 for sediment movement from shelf areas to abyssal plains; 

 currents along the canyons have also been considered as having 

 an active role in sediment movement. Long-term monitoring 

 studies have identified both up- and down-canyon flow in 

 canyons whose reversals coincide with diurnal tides for 

 the west and east coasts of the U.S. (Shepard and Marshall, 

 1978; Keller and Shepard, 1978). The net bottom transport 

 is down-canyon, however, resulting in fans at the base of the 

 canyons containing sands, graded bedding and shallow water 

 shells (Ericson et al., 1961; Horn et al., 1971). Some debate 

 has continued concerning active erosion indicated by bare 

 bedrock as opposed to low current velocities indicated by 

 very fine silts and clay. Lydonia Canyon seems to be an 

 exception to most northeast U.S. canyons in that its cover 

 of fine-grained sediment displays little or no current 

 activity (Ross, 1969) . On the other hand, currents as high 

 as 75 cm/sec have been recorded in Hydrographer Canyon and 

 between 100-200 cm/sec in a turbidity current in Oceanographer 



