Archive image from page 192 of The depths of the ocean. The depths of the ocean : a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceangen00murr Year: 1912 IV DEPTHS AND DEPOSITS OF THE OCEAN 157 ocean-floor. Where basic volcanic rocks are in process of decomposition, manganese nodules may be relatively abundant in shallow water, and they are never numerous in Globigerina oozes, ex- cept where volcanic material is present in some abundance in the deposit. Sulphate of barium h
Archive image from page 192 of The depths of the ocean. The depths of the ocean : a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceangen00murr Year: 1912 IV DEPTHS AND DEPOSITS OF THE OCEAN 157 ocean-floor. Where basic volcanic rocks are in process of decomposition, manganese nodules may be relatively abundant in shallow water, and they are never numerous in Globigerina oozes, ex- cept where volcanic material is present in some abundance in the deposit. Sulphate of barium has been Barium. found to be present in most marine deposits and in manganese nodules in small quantities; in terrigenous deposits up to about o. i per cent, in manganese nodules slightly more, and in Red clays up to about i per cent. Small round nodules have been trawled off Colombo, in 675 fathoms, containing 75 per cent of barium sulphate. -Glauconite occurs in the terri- Giauconite. genous deposits typically in the form of minute rounded grains of a green- ish colour, usually associated with greenish or brownish casts of calcareous organisms (foraminifera, etc.) ; in fact, the rounded Fig. 127.—Tooth of Oxvrjj/xa TRIGODON. 'Challenger' Station 276, Tropical Pacific, 2350 fathoms.
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