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PROBLEMS AND PERSPECTIVES IN BOREAL-TETHYAN CORRELATION OF THE MIDDLE JURASSIC MARINE SEDIMENTS OF SIBERIA

An analysis of the current state of research in the field of Boreal-Tethyan correlation of the Middle Jurassic marine sediments of Siberia is given. Further perspectives are closely related to the obtaining and mutual coordination of the results of bio- and chemostratigraphic, biofacial and biogeographical studies of the Middle Jurassic of Siberia and adjacent territories, and is thus expected to reveal a set of calibrated markers (traces of biotic and abiotic events) that will contribute for interregional and global correlations.