962 



SUBJECT INDEX 



Trenches — continued 

 previous work, 411 ff 

 protection against turbidity currents, 659 

 sedimentary fill, 415, 420, 423 

 seismicity, 412 ff 



sounding, 415 ff 



stratification of floor sediments, 422 



structure and origin, 426 ff 

 "tectogene", 412 



terraces, 423 



topography, 415 ff 



turbidity currents filling, 761 



volcanoes, 414 

 Trieste bathyscaph, 416 

 Trincomalee Submarine Canyon, 491, 501 

 Trinidad, 641 

 Tripylea, 875 

 Tristan da Cunha, 366 

 Tromso, 289 



Tropospheric transport, 694 

 Trough-shaped submarine valleys, 493 ff 

 Trou Sans Fond, 302 

 Tsimamis, 131, 751 

 Tuamotu, 275 ff, 366 ff, 370 ff, 381 ff, 873, 



883 

 Tubuai, 366 ff 

 Tufts Abyssal Plain, 324 ff 

 Tunisia, 300 



Turbidity currents, 73, 338, 360, 496, 521, 

 659, 742 



biological significance, 764 



cable breakages ascribed to this and 

 alternative hypotheses, 749 ff 



conclusion, 771 



deposits from, 904 



early views, 742 ff 



earthquakes as triggers for, 743 ff 



full scale experiment, 743 ff 



Grand Banks earthquake, 743 ff, 749 ff 



homogenized history, 768 ff 



hurricanes as triggers for, 759 



Orleansville earthquake, 748 ff 



physiographic evidence, 751 ff 



sediments, 752 ff 



tectonic significance, 761 ff 

 Turpie submerged atoll, 252 

 Tyrrhenian Sea, 253, 328 



Ultraviolet light, energy source for synthesis 



of organic compounds, 852, 855 ff 

 Unconsolidated sediments, 73 

 critical angle for reflection, 79 

 gradients and low-velocity sediments, 

 75 ff 



Unconsolidated sediments — continiied 



Layer 2, 83 



marine seismic measurements, 73 



pelagic currents, 73 



summary, 82 ff 



thickness and velocity, 73 



turbidity currents, 73 



variable angle reflections, 76 

 Underwater photography, 437, 473 



cables and winches, 475 



camera details, 474 ff 



data chamber, 474 ff 



difficulties of identifying rock types, 439 



exogene traces observed, 460 



flashlight, 473 



sonar, 475 



world distribution of photographs, 438 

 Underwater television, 437, 473 

 United States: see also Navy Electronics 



Laboratory 

 United States Coast and Geodetic Survey, 



194, 389 ff, 742 

 United States east coast, 638, 648, 762 

 United States seamounts off northeast 



coast, 248 

 Uranium and transition metals, 611, 684, 



817, 822 ff, 888, 900. 916 

 Urey equilibrium, 849 

 Ushant, 283, 293, 452 



Valders unit, 918 



Var delta, 625 



Vema Abyssal Gap, 257 ff. 318, 345 



Vema (Russian) R.V., 143, 315, 318, 352, 



356. 393 ff 

 Venezviela, 331, 335, 639 ff 

 Ventura basin, 903 

 Verkhoyansk Trough, 404 

 Vermilion Sea Expedition, 146 

 Versilia river, 901 

 Vesicular basalts, 443 

 Vibrotron pressure gauge, 135 

 Villafranchian mammal flora, 891 

 Vineyard Sound, 55, 68 ff 

 Virgin Islands, 427 

 "Vital force", 845 

 Vitiaz Depth, 419, 424 

 Vitiaz R.V., 411, 416, 424 

 Volcanoes, 257, 261, 266, 368ff, 399, 406, 414 



ash and glass, 698, 735 



energy from, 852 



Pleistocene activity, 889 



sediments from, 507, 586, 672 



submarine lava flows, 439 



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