Image from page 273 of “Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen” (1912) by Internet Archive Book Images

Identifier: scienceofseaele00chal
Title: Science of the sea. An elementary handbook of practical oceanography for travellers, sailors, and yachtsmen
Year: 1912 (1910s)
Authors: Challenger Society Fowler, G. Herbert (George Herbert), 1861-1940
Subjects: Oceanography Ocean
Publisher: London, John Murray
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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Text Appearing Before Image:
miles (or 128,824,000 squarekilometres)—i.e., about 22,500,000 square miles in theAtlantic Ocean, about 14,800,000 square miles in thePacific Ocean, and about 12,220,000 square miles inthe Indian Ocean. 5. Pteropod Ooze.—This deposit differs from Globi-gerina Ooze only in the greater abundance of theshells of pelagic Molluscs (Pteropods and Heteropods),and occurs characteristically at lesser depths than theGlobigerina Ooze (Fig. 164). Thus Pteropod Ooze maybe said to attain its typical development at depths of800 to 1,000 fathoms, while Globigerina Ooze occurstypically at depths of 1,500 to 2,000 fathoms. Thereason why the shells of pelagic Molluscs are removedfrom the deposits at lesser depths than the shells ofpelagic Foraminifera is believed to be that these thinand fragile shells present a larger surface to the solventaction of sea water. Pteropod Ooze is estimated to cover an area ofabout 400,000 square miles (or 1,000,000 squarekilometres), principally in the Atlantic Ocean.

Text Appearing After Image:
Fig. 161.—Diatom Ooze. (After Chun, from KrOmmelsoceanographie, by permission of j. engelhorns ver-lag in Stuttgart.) 1-5, Coscinodiscus ; 6, Asteromphalus ; 7, Fragilaria antarctica ;8, 9, Synedra ; io, Rhizosolenia ; 11, Chaetoceras ; 12, Navi-cula (?) ; 13, Dictyocha ; 14, a broken Radiolarian.

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