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The Atlantic Ocean Basin and Its Margins
On the basis of seismic refraction work the typical floor of the Atlantic Basin has to 1 km. of unconsolidated sediment and 5 km. of basaltic rock over a very thick layer of ultrabasic rock identical with that found at about 40 km. depth beneath the continents. The high mobility of ocean bottom sediments through turbidity currents account for the flat floors of the basins and the kinds of sediments found in them. These currents can account for the great accumulation of unconsolidated sediments found in the Puerto Rico Trough. Granitization of such accumulations of sediment in the past may have been an important factor in the growth of continents.
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