. The Earth beneath the sea : History . l\ 200ti . Fig. 9. Sponge spicules from an Atlantic pelagic sediment. (Lament core A167-44, 25° 40'N, 77'' 21'W, 5-10 cm below sediment surface.) Jouse (1959) found a correspondence between diatom biocoenoses and thanato- coenoses in the western part of the Bering Sea, again allowing for impoverish- ment of the thanatocoenoses due to selective dissolution of the dehcate frustules of some species. A less direct approach is to chart distributions of species and assemblages in Recent sediments and compare them with the pattern of overlying water masses. If
. The Earth beneath the sea : History . l\ 200ti . Fig. 9. Sponge spicules from an Atlantic pelagic sediment. (Lament core A167-44, 25° 40'N, 77'' 21'W, 5-10 cm below sediment surface.) Jouse (1959) found a correspondence between diatom biocoenoses and thanato- coenoses in the western part of the Bering Sea, again allowing for impoverish- ment of the thanatocoenoses due to selective dissolution of the dehcate frustules of some species. A less direct approach is to chart distributions of species and assemblages in Recent sediments and compare them with the pattern of overlying water masses. If the pattern of faunal assemblages in Recent sediments mirrors that of the more or less discrete water masses above, it appears permissible to conclude that the assemblages of living organisms represented are related to those water masses, and that there has been little lateral displacement of the skeletons during their descent to the sea floor. Kanaya {in litt.) is engaged in a study of the diatoms in Quaternary sediment samples from the Pacific floor, and has been able tentatively to distinguish five distinct diatom assemblages in
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
