F-16 

 quently covered a wide depth range and several canyon 

 environments, so that it is difficult to make specific con- 

 clusions based on sediment analysis alone. 

 Results 



Baltimore Canyon 



The distribution of sediments and outcrops in Baltimore 

 Canyon is shown in Fig. F-6. This map is based on acoustics 

 and photographic coverage. Thin strips of outcropping rock 

 are seen along the walls of the thalweg and at the sharp bend 

 in the axis at 500 meters previously described. Another 

 area of exposed outcrop was noted on the west flank of the canyon 

 where talus blocks were also found during the photographic 

 survey. Photo analysis shows that sediments in the thalweg are 

 rippled. Mollusc fragments are common in the thalweg and 

 in shelf deposits recovered in cores and dredges. Analysis 

 of cored sediments indicates that the thalweg and shelf sed- 

 iments are sandy with sand percentages as high as 81.5%. 

 Sediments on the walls tend to be poorly sorted silts (Fig. 

 F-7) . Several deposits of clay were noted during the photo 

 survey, but only clay sediment was recovered in only one core. 

 This may be due to a bias introduced by the difficulty in 

 coring hard clay deposits. A complete listing of core data 

 from Baltimore Canyon may be found in Table F4. Sediments 

 recovered in dredged samples are similar to those found in 

 cores. Rocks were recovered in a number of dredges in 

 Baltimore Canyon (Table Fl) . For the most part, these were 

 found in the area of the sharp curve in the axis. These 

 rocks are generally hard glauconitic siltstones, sandstones. 



