Mihailov Alexey Mikhailovich RussiaSaratovSaratov State University, 83, Astrakhanskaya Str., Saratov, 410012, Russiapimenovmv@gmail.com Author's articles About Possible Reflexion of Paleocological Conditions in Petromagnesism of Kallovian - Oxfordian Deposits of Dubki Section (Saratov)