Archive image from page 193 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 depthsofoceange00murr Year: 1912 156 DEPTHS OF THE OCEAN calcareous remains, or form irregular concretionary masses, though the commonest form is that of more or less rounded nodules (see Figs. 134 and 135), which at any one station have a general family resemblance and differ in form and size from those taken at another station, looking like marbles at on
Archive image from page 193 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 depthsofoceange00murr Year: 1912 156 DEPTHS OF THE OCEAN calcareous remains, or form irregular concretionary masses, though the commonest form is that of more or less rounded nodules (see Figs. 134 and 135), which at any one station have a general family resemblance and differ in form and size from those taken at another station, looking like marbles at one place, like potatoes or like cricket balls at other places. Gener- ally the nodules are concretions formed around a nucleus, con- Fig. 126.—Tooth of Carcharodon megalodon. 'Challenger' Station 281, South Pacific, 2385 fathoms. sisting of a shark's tooth or whale's earbone, or portions of teeth or bone, a piece of pumice or fragment of volcanic glass, etc., though sometimes no nucleus could be detected. These nodules of iron and manganese are classed with the impure variety of manganese known as wad or bog manganese ore, and the greater part of the manganese and iron is believed to have been derived directly, along with clay, from the alteration of the rock- fragments and mineral particles containing manganese and iron, especially of those of volcanic origin, which are spread over the
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