Prof. Platon Tchoumatchenco and Acad. Prof. Todor Nikolov published their research on the life and the scientific creativity of three Bulgarian geologists of Russian origin - Doc. Eng. Andrei Janichevsky (1904-1949), Dr. Rostislav Beregov (1908-1946) and Dr. Svetlana Cernjavska (1929-2002). Two of them arrived in Bulgaria after the Civil War in Russia with their families; S. Cernjavska was born in Serbia and moved to Bulgaria after 1948. Doc. Eng. Andrei Janichevsky was specialist of the geology of ore deposits, the regional geology and the geology of the metamorphic rocks of Strandzha and Rhodopes (Southern Bulgaria). Dr. Rostislav Beregov was specialist of the Tertiary coal basins - brown and lignite coal, the stratigraphy and the paleontology of Tertiary. Dr. Svetlana Cernjavska was the founder of the Paleopalynology in Bulgaria and studied Paleogene palynomorphs (South West and North East Bulgaria and the Rhodopes Mountains) and Lower and Middle Jurassic palynomorphs from land outcrops (Eastern Stara Planina) and the deep wells for oil and gas prospection in the Moesian Platform in North and North East Bulgaria.
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