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The paramagnetic properties of core samples from the section of the reference well was investigated on the basis of a representative sample (204 samples, along 1562, 9? ? 1478,4m depth and 84,5m powerful) by electron paramagnetic resonance (EPR) for mineral associations of the Liven horizon of the Upper Devonian deposits of the Volga-Ural region of the Republic of Tatarstan. In fact, according to the results of the EPR studies, the Liven?s horizon is a continuation of the regressive cycle of calcareous deposits of...