Kukhtinov Pavel Dmitrievich RussiaMoscow region“Gazprom VNIIGAZ”, 5537th Projected Ave, possession 15, building 1, Razvilka, Moscow Region, 142717senior researcherpavelkukhtinov@yandex.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