Issues of determining the depths of the seas of the geologic past and their evolution
Abstract
Finding out the depths of the seas of the geological past is of undoubted interest in the preparation of lithologic-paleogeographic maps, in establishing the conditions of formation of sediments, with which a number of deposits of sedimentary minerals are associated. There is a set of methods for determining the relative depth of ancient basins. The characterization of absolute depths of ancient seas is given on the basis of the principle of actualism. In particular, L. V. Rukhin, taking into account the spread of underwater erosions and algae in modern seas to a depth of 50-70 m, believed that “... these limit values are also applicable to ancient basins, as they are determined by physical factors almost unchanged with time”. Usually, however, greater depths are allowed. Since in modern seas the edge of the shelf, characterized by optimal conditions for organic life, passes at a depth of about 200 m, it is assumed that finds of organic remains in marine sediments indicate depths of up to 200 m ...
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