File:South African Geology - Schwarz - 1912 Fig 8.png
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English: Figure from South African Geology - Schwarz - 1912
Fig. 8. — Forms of Life that contribute to the Organic Deposits in Deep Oceans a, Holtenia carpenteri, Wyville Thomson, a siliceous sponge, the spicules of which go to form the flint nodules in chalk and the bands of chert in dolomite, b, Pentacrinus wyville-thomsoni, Jeffreys, a crinoid that yields calcium carbonate to the sediments, c, Globiyerina bulloides, d'Orbigny, highly magnified. The dead shells are shown as they fall to the bottom of the sea. d, Coccosphere, made of coccoliths very highly magnified, c and d are free-swimming organisms that yield the greater amount of calcareous matter to the deep sea oozes which consolidate as chalk. (From Professor Wyville Thomson's Depths of the Sea, Macmillan & Co.) (Page 49) |
| Date | |
| Source | File:South African Geology - Schwarz - 1912.djvu |
| Author | Schwarz, Ernest Hubert Lewis, 1873-1928 |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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