180 



THE OCEAN FLOOR 



Scripps Institution of Ocea- 

 nography, 21, 24, 41, 42n., 

 71, 88f., 162 



Sea mounts, 72 



Sediment: age, 48, 52, 60-1; 

 components, 48ff., 77, 

 89ff., 102ff.; distribution, 

 53; equipment for measur- 

 ing, 34, 55if., 85, 87; geo- 

 chronology, 112ff.; methods 

 of measurement, 54, 55ff.; 

 origin, 22, 48; recent in- 

 vestigations, 30, 54ff., 69ff.; 

 stratigraphy, 77ff., lOlff.; 

 thickness, 52ff., 69ff.; 

 transportation of, 74ff.; 

 velocity of sound in, 57-8, 

 65, 72, 74 



Sediment cores. See Cores 



Sedimentation, rate of, 5 Iff., 

 61 



Seismic waves, utilization of, 

 54ff. 



Shepard, Francis, 42, 75, 140, 

 149 



"Sial" and "Sima," 63ff. 



Siliceous algae. See Diatoms 



Smith-Grimaldis, 124n. 



SOFAR layer, 65 



Solomon Deep, 159 



Stetson, H., 140 



Submarine canyons, 7, 75, 

 147 



Submarine erosion, 147 



Submarine landslides, 80 



Submarine volcanism. See 

 Volcanic eruptions, sub- 

 marine 



Substratum, nature of, 63ff., 

 72, 74 



Suess, Eduard, 20n., 63 



Sunda Double Trench, 10 



Swallow, J. C, 72 



Swedish Deep-Sea Expedition 

 of 1947-48, 38,40, 42,46, 

 69, 73, 76, 79, 86f., 89, 92, 

 101, 118, 135, 145, 152, 

 157; Reports of, 43, 86 



Swedish Research Council, 

 89, 101 



Taylor, Frank B., 16 

 Terra Australis, 2 

 Thetys Sea, 15 

 Tolstoy, Ivan, 22, 41, 67ff. 

 Trawling, 156ff. 

 Turbidity currents. See Bot- 

 tom currents 

 Tyrrhenian Sea, 76, 78, 99 



Urey, Harold, 13, 18 

 Urry, William D., 116, 118 



Vastage, 78 



Volcanic eruptions, sub- 

 marine, 62, 77, 80-1, 91, 

 146 



Volcanic glass, 99 



