Geological-paleooceanographic situations of Devonian sedimentation within Fore-Dobrudja segment of Paleotethys have been considered. It has been shown that subsidence and cold climate caused terrigenous sedimentation predominance in Early Devonian with local progress of organogenic carbonates. Ascendant tectonic movements and aridization of climate in Middle – Late Devonian caused sulphate-carbonate depositionsof cyclic structure in half-isolated basins, fixed by changes of relative level of the ocean.

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