. The Earth beneath the sea : History . Fig. 3. Silicoflagellates from pelagic sediments, a-c, Eocene; d, e, Miocene. Atlantic and Indian Oceans, Kolbe (1957) found the warm-water assemblage to be similar in the three oceans, and different from the assemblages characteristic of high latitudes. C. Silicoflagellaies The living organism comprises a small, flagellated cell with an associated siliceous skeleton of hollow bars which form a spiny ring, variable in form and in most species simply reticulated (Fig. 3). Silicoflagellates occur in all parts of the oceans, and although their skeletons are
. The Earth beneath the sea : History . Fig. 3. Silicoflagellates from pelagic sediments, a-c, Eocene; d, e, Miocene. Atlantic and Indian Oceans, Kolbe (1957) found the warm-water assemblage to be similar in the three oceans, and different from the assemblages characteristic of high latitudes. C. Silicoflagellaies The living organism comprises a small, flagellated cell with an associated siliceous skeleton of hollow bars which form a spiny ring, variable in form and in most species simply reticulated (Fig. 3). Silicoflagellates occur in all parts of the oceans, and although their skeletons are found in almost all sediments containing diatoms, they never constitute a significant proportion of the mass of pelagic sediments. As a result probably of the small size of these organisms (generally 10-50 [x), little is known of their biogeography (Gemeinhardt, 1930). D. Foramiiiifera The chambered tests of these protozoans, generally about 50-1000 y. in size, are the major component of the calcareous microfossils in Quaternary pelagic sediments. Most of the tests accumulating on the deep-sea floor are of plank- tonic species (Fig. 4) which inhabit i^rinciiDally the upper part of the water column, to a dejjth of 100-300 m. Tests of benthonic sjiecies, some of them
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
