Continental slope, 1, 15-48, 107 benches on, 41, 42-51 currents on, 50 definition, 18 geologic map of, 51 photographs of, 39 profiles of, 28, 29 Convection currents, 103 Coral, photograph of, 39 Corner Rise, 63, 64, 77 Corner Seamount, 77 Cretaceous outcrops Bahamas, 47 Blake Escarpment, 47 Caryn Seamount, 78 Georges Bank, 43 Cruiser Seamount, 98 Crustal convection currents, 103 Crustal structure continental margin, 52, 53, 102, 107 Mid-Atlantic Ridge, 100, 102, 107 ocean-basin floor, 80, 81, 102, 107 trans-Atlantic structure section, 102 Currents, deep-sea bottom photographed evidence of, 39, 59, 79 scour, 50, 51, 59, 79 velocities of, 50 Deeps Nares, 55 Sohm, 55 Deep-sea channels, 66 Deep-sea sands, 28, 35, 36, 53, 58, 59, 60, 61, 65, 74, 75, 80, 99, 106, 107 Diabase, 99 DISCOVERY II, Royal Research Ship, vii Easter Island Ridge, 103 Echo sounders early sounding machines, 8 invention of, 8 Lamont-Facsimile PDR, 8, 9 NMC, 7, 8, 22, 23, 24, 31, 68 UQN-1B, 7, 8, 69 Echo soundings accuracy of, 3, 9 sources of, 3, 5, 6, 7 units employed, 12 "Echo-time" depth, nominal fathoms, 12 Emerald Bank, 24 Eocene outcrops, 46, 47, 48, 76 Epicontinental seas, 1, 15, 18 Erosion, submarine, 23, 39, 50, 51, 74, 79, 80, 99, 105, 106, 107 Esso Hatteras Light Test, 43, 46, 47 Eugeosyncline, 54 Exaggerated profiles, plotting of, 5 Exuma Sound, 35, 49 Faulting, 42, 51, 76, 103, 107 Fecal pellets, photographs of, 39, 79 Flemish Cap, 21 Foraminifera, displaced, 60 French Hydrographic Service, 38 Georges Bank, 25, 43-45 Georges Bank canyons dredging, 44-45 identification of benches, 44 outcrops on, 43-44 Geosynclines, 53-54, 107 Gibraltar, Straits of, 38 GLACIER, U.S.S., 55 _Globigerina_ ooze, 33, 53, 106 Gradients, conversion tables, 12, 15 Gran Canary Island, profile near, 39 Grand Banks earthquake, 22 Grand Banks sector, 21 Gravel, 59, 79 Gravity anomalies, 2, 65, 100 Graywacke suite, 53 Great Meteor Bank, 98 Guiana Basin, 12 Gulf of Maine, 17, 24, 25 sub-bottom echoes, 105 Gulf of Mexico escarpments, 18, 33 Gulf of St. Lawrence, 17 "Gully," the, 24 Guyots, 78 _Halimeda_, 60 Hatteras Abyssal Plain, 56, 57, 58 Heat flow, measurement of, 103 High Fractured Plateau, 1, 15, 90, 91, 94, 95, 99 Hispaniola-Caicos Abyssal Plain, 56, 60 Hispaniola-Caicos Channel, 36 Holothurians, photographs of, 39 Horseshoe Abyssal Plain, 57, 61 Horseshoe Seamount Group, 59, 78 Hudson Submarine Canyon, 8, 27-28, 31, 58, 72 Hudson Submarine Channel, 8 Hudson Submarine Delta, 28, 78 Hydrographic Department, British Admiralty, vii, 3, 6 Hydrographer Canyon, 43 Iberia Abyssal Plain, 56, 60 Iberia Basin, 12 Intermontane basins, 95, 99