LIST OF FIGURES 



Figure 1. The nine submarine canyons along the southern flank of 



Georges Bank viii 



Figure 2. Georges Bank and currents 9 



Figure 3. Gulf Stream rings 11 



Figure 4. Mean Eulerian current 12 



Figure 5. Kinetic energy spectra of near-bottom currents on the shelf 



and slope adjacent to Lydonia Canyon 14 



Figure 6. Spatial distribution of energy in the near-bottom currents 



along the axis of Lydonia Canyon 16 



Figure 7. Percent current exceeds 20 cm/s 18 



Figure 8. Percent fine sediments in the surficial sediments on the shelf 



and slope adjacent to Lydonia and Oceanographer Canyons .... 19 



Figure 9. Surficial sediment texture along the axis of Lydonia Canyon . . 20 



Figure 10. Histograms showing the flux of resuspended sediment at 



different heights above the bottom 38 



Figure 11. A. Histogram showing the relative mass of sediment 

 collected at station LCP 



B. Schematic diagram showing position of teflon timing 

 layers and layers of coarser sediment 



C. X radiograph of the sediment trap sample 



D. Record of bottom stress 



E. Calculated flux of trapped sediment 40 



Figure 12. Carbon-14 age of organic carbon in marine sediments from the 



head of Lydonia 43 



Figure 13 Concentration of barium in the fine fraction of material 



collected in sediment traps 44 



Figure 14. Histogram showing the abundance of metals relative to world 



average shales 45 



Figure 15. Isotope data suggest active processes in the canyon axis ... 47 



Figure 16. Activity of plutonium-239/-240 with depth in sediment cores . . 49 



Figure 17. Seasonal variations in total hydrocarbon concentrations in 



sediments 54 



Figure 18. Seasonal variations in pristane concentrations in sediments . . 55 



Figure 19. Map of Oceanographer, Heeltapper, and Filebottom Canyons ... 81 



Figure 20. Map of Gilbert and Lydonia Canyons 82 



Figure 21. Map of Hydrographer Canyon 83 



Figure 22. Cross section of 12 Georges Bank canyons and Hudson Canyon 



at the 200-m isobath 84 



V - 



