442 



LAUGHTON 



[chap. 18 



Fig. 6. 43° 31..5'X, 12° 3fi'W. Depth 5200 m. Head of Biscay-Iberia inlerplain channel. 

 (Photo by N.I.O.) 



Semi-consolidated sedimentary rocks exposed on the cliffs of an eroded channel cut 

 into the Biscay abyssal plain by turbidity currents. These may represent the degree 

 of lithification of abyssal -plain sediments buried some 100 m deep. 



Fig. 7. 11°51'N, 164° 55'E. Depth 1730 m. Sylvania Tablemount near Bikini. Area of 

 picture 1^ by U m. (U.S. Navy Electronics Laboratory photo by C. J. Shipek.) 



Manganese-encrusted volcanic boulders and rippled Globi(/eriita ooze. Similar 

 boulders were dredged near by, showing these rocks to be olivine-basalt boulders 

 coated by a thick crust of manganese. 



