Kukhtinov Dmirty Akimovich RussiaSaratovSaratov State University, 83, Astrakhanskaya Str., Saratov, 410012, RussiaprofessorDoctor of Geologo-Mineralogical Sciencessheglov@nvniigg.san.ru Author's articles On the Regional Prepermian Unconformity in the Sections from the edge Zones of the Pricaspian Depression Kungurian Ostracod Biofacies Paraparchites as a Biostratigraphic Correlation Reference and Hydrocarbons Exploratory Search Sign