Abstract
Abstract The comparison of data on contemporary phytoplankton evolution with information about Precambrian phytoplanktonic organisms received during the last 20 years indicates that, from the moment of the appearance of oceanic vegetation, the evolution of phytoplankton has been determined by the same facts and been dependent on the same conformities with a law as in the contemporary world ocean. In view of the necessity of oxygen existing in the Earth's atmosphere in the early Precambrian and connecting this with the existence of photosynthetic phytoplankton, the author suggests the possibility, that a special fossil plant group has been lost sight of by investigators and palaeobiologists. With the help of the method given in this work, it has become possible to state that residues of phytoplanktonic organisms are present in practically all primary sedimentary rocks. They are combined in the family of Menneriaceae Lopuchin, genus Menneria Lopuchin. Investigations carried out after this article had been s...
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