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Abstract

The marine sedimentologist inevitably is faced with the necessity of choosing valid names for different sediments as well as their combination into natural groups on the basis of their similarities. Proper nomenclature and classification are extremely important not only for marine geology but also for petrology in general. Attempts to classify sediments into specific groups have marked sedimentology since its early beginnings.

Classifications should be based on objective quantitative characteristics of the basic properties which determine the physical, chemical and mineralogical nature of sediment. It is particularly important that the classification have a quantitative basis and not be purely qualitative, as were many old classifications.

The classification of marine sediments should not be substituted for that of marine sedimentary facies. This reservation is necessary because the physical and geographical or facies conditions of sediments are emphasized instead of their material composition or structural features in many foreign classifications such as the well-known schemes of Murray and Renard (1891), Krummel (1907), Andree (1920, 1925). Revelle (1944) and other scientists who distinguished pelagic, terrigenous, deep-sea, shallow-water and littoral sediments. In so doing, these workers often placed sediments of very similar or identical composition under extremely different headings of their classifications. Although schemes of this kind may have a certain significance (Nalivkin, 1956), they cannot fully meet the requirements of the petrology of sediments with all their chemical, mineralogical and structural peculiarities. Of course this does not mean that the classification

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