. 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. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. IV DEPTHS AND DEPOSITS OF THE OCEAN 145 origin, derived from (i) the decomposition of terrestrial and submarine rocks, (2) extra- terrestrial sources, (3) pro- ducts synthesized at the bottom of the sea. Organic remains belong- Materials of ing to the vegetable kingdom "^g^™'^ ongi"- are on the wh
. 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. "Michael Sars" North Atlantic Deep-sea Expedition (1910); Oceanography; North Atlantic Ocean. IV DEPTHS AND DEPOSITS OF THE OCEAN 145 origin, derived from (i) the decomposition of terrestrial and submarine rocks, (2) extra- terrestrial sources, (3) pro- ducts synthesized at the bottom of the sea. Organic remains belong- Materials of ing to the vegetable kingdom "^g^™'^ ongi"- are on the whole compara- tively rare on the sea-floor, when compared with those belonging to the animal kingdom ; still, in the neigh- bourhood of land, vegetable matter, branches of trees, piant remains leaves, fruits, etc., may be carried into deep water through the agency of large rivers, storms, off- shore winds, etc., along with the shallow water. Similarly. in marine deposits. Fig. 108. Discosphara thomsoni, Ostenfeld. From the surface remains of sea-weeds in coral-reef re- gions, the re- mains of algae which lived on the reefs, such as LithotJiani- niuin and Coral- Una, occur in the deposits in the vicinity. But the most con- stant compon- ents of vegetable origin are the remains of algse, which secreted either calcium carbonate or silica from the surface waters of the ocean to form their hard parts, viz. the calcareous coccospheres and rhabdospheres (see. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Murray, John, Sir, 1841-1914; Hjort, Johan, 1869-; Appellöf, Jakob Johan Adolf, 1857-; Gran, H. H. (Haakon Hasberg), 1870?-; Helland-Hansen, Bjørn, 1877-. London : Macmillan
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