F-14 

 thalweg to the west going up-canyon. Dredging and photography 

 revealed that there are solid rock outcrops at this point. 

 Figure F-2 shows a perspective view of cross sections of the 

 canyon along a straightened axis. The locations of the 

 transects are shown on Fig. F-6. 



Oceanographer Canyon (Fig. F-3) is the most deeply incised 

 of the three canyons. The thalweg is narrow and curves slightly 

 northwest to southeast from head to mouth. The walls of the 

 canyon are quite steep with numerous small side tributaries. 

 There is a large secondary channel to the east of the thal- 

 weg, debouching into the canyon at about 1600 meters depth 

 in the main axis. The perspective view along a straightened 

 axis of the canyon is shown in Fig. F-4. 



Lydonia Canyon (Fig. F-5) is the smallest of the three 

 canyons. The thalweg is quite narrow, particularly in the 

 lower part of the canyon. The walls are generally steep 

 with a slight increase in slope just above the thalweg. 

 As in Baltimore and Oceanographer Canyons, the walls are 

 incised by numerous small side tributaries. The walls of some 

 of the side tributaries are also quite steep. 

 Methods 



Sediments were recovered by day dredging and gravity 

 coring during the field program of this study. These 

 materials were analyzed sedimentologically and biostratigraph- 

 ically. The location of gravity cores, dredges, and camera 

 runs in the three canyons is shown in Figs. F-1, F-3, and 

 F-5. 



