. 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. Oceanography. 158 DEPTHS OF THE OCEAN occasionally they are cemented into nodules, several centimetres in diameter, by a phosphatic substance ; the grains are always rounded, often mammillated, hard, dark green, or nearly black, with sometimes a dull and sometimes a shining surface. Mixed with the rounded grains are pale green, pale grey, white, yellow and brownish internal casts of the cavities and chambers o
. 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. Oceanography. 158 DEPTHS OF THE OCEAN occasionally they are cemented into nodules, several centimetres in diameter, by a phosphatic substance ; the grains are always rounded, often mammillated, hard, dark green, or nearly black, with sometimes a dull and sometimes a shining surface. Mixed with the rounded grains are pale green, pale grey, white, yellow and brownish internal casts of the cavities and chambers of calcareous organ- Fig. 131.âBlack Spherule isms, often asSO- with Metallic Nucleus ciated. Fig. 130.âBlack Spherule with Metallic Nucleus (Â¥)â¢â "Challenger" Station 285, South Pacific, 2375 fathoms. (6T°). " Challenger " Station 9, North Atlantic, 3150 fathoms. with an amorphous organic matter of a brown- ish - green colour. Glauconite is principally developed in the interior of foramini- ferous shells and other calcareous structures, the initial stages in the formation of glauconite being probably due to the presence of organic matter in the interior of these shells. Glauconite is. 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-. London Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1912
