F-18 

 The percentage of sediment greater than 63 microns is listed in 

 Table F2. The values range from 2% to 33% of the total 

 sediment. Based on our observations in other canyons the 

 sand content should be much higher in the thalweg and on the 

 adjacent shelf. A number of our dredges intersected the 

 thalweg but no sand was recovered. Because of this we 

 conclude that our sediment sample is not totally representative 

 in this canyon. " 



Rock samples were recovered in most of the dredges taken. 

 These include siltstones, sandstones, mudstones, and con- 

 glomerates. A listing of sediment and rock types is given 

 in Table F2. Much of the sandstone and siltstone recovered 

 is dark grey to black, micaceous and glauconitic. An organic 

 carbon analysis was performed by George Claypool of the 

 U.S.G.S. on two samples of this material. The organic carbon 

 content was found to be 1.2% which is above average in marine 

 sediments. However, the analysis indicates almost no hydro- 

 carbon generating potential. 



The carbonate content of the dredged muds varies consid- 

 erably with values ranging from 0.7% to 22%. The carbonate 

 component is comprised of foraminifera, coccoliths, and shell 

 fragments. In general, the carbonate percentages are somewhat 

 higher in the older rocks than in the Quaternary muds. 



The dredged rocks range in age from upper Turonian (approx- 

 imately 95 m.y.B.P) to Quaternary. The glauconitic micaceous 

 sandstone and siltstone described above are of Turonian and 

 Santonian age. An upper Miocene siltstone (6 m.y.B.P.) was 

 recovered in Dredge 20. In general the older material was not 



