deep channels are mainly the result of constructional processes through differential 

 deposition and bypassing. 



On the other hand, TalwanI and Worzel (in Siegler, 1961) collected additional 

 gravity data and attributed negative residual anomalies of -30 to -40 milligals over 

 the deeply incised portions of the Bank to faulting which resulted in the heavier 

 sediment occurring at greater depths. 



A technical report by the University of Miami (1958) stated that lack of a source 

 of large quantities of sediment negates the possibility of turbidity current erosion 

 creating the TOTO, but, suggested that the channel originated through some type of 

 block faulting. 



Bottom Sediments: The first reported bottom samples taken from the TOTO were 

 collected by Vaughan (1918). He classified the sediment as globigerina ooze, and 

 also performed size and mineralogical analyses on the two cores collected. Armstrong 

 (1953) collected dredge and core samples from the TOTO and bottom photographs at 

 selected locations. The photographs show an almost vertical bare rock wall down to 

 230 meters, and at 383 meters sand and gravel covers the rock. Between 500 and 600 

 meters depth the sands and gravels are intermixed and finally replaced by calcareous 

 mud which becomes increasingly finer with depth to the bottom of the channel (2,200 

 meters in the area examined). 



Analyses of cores and dredge samples taken from the TOTO are presented in a 

 technical report by the University of Miami (1958). This report classified the bottom 

 material as globigerina, pteropod, and oolitic ooze. The report also presented the 

 results of sediment size, moisture, faunal, and semiquantitative spectrographic analy- 

 ses. The report discussed the hummock-like appearance of the slope along the entire 

 length of the TOTO between 300 and 550 fathoms. This feature was considered to be 

 talus that probably originated from stirring up of material found on the top of the bank 

 in addition to turbidity currents originating on the edge of the bank which augmented 

 the talus slope. 



Ostlund et al (1962) presented the results of radiocarbon measurements of the 

 TOTO sedimeTit "cores collected by the Marine Laboratory, University of Miami, and 

 discussed the age of the sediment, bulk rate of accumulation, and frequency of tur- 

 bidity current flows in various areas of the channel. 



Athern (1962 a & b) undertook a detailed bathymetric reconnaissance of the TOTO, 

 collected sediment cores from the central flat reaches of the channels, and obtained 78 

 bottom photographs at various locations. 



Rusnak and Nesteroff (1962) discussed the structural characteristics of turbidity 

 current deposits in the TOTO, their composition, area of origin, and frequency of 

 occurrence. They further compared the characteristics of turbidity current deposits in 

 the TOTO to abyssal plain terrigenous deposits laid down in a similar manner. 



