Atkin Vsevolod Stanislavovich RussiaSaratovSaratov State University, 83, Astrakhanskaya Str., Saratov, 410012, Russiapost-graduate studentceba91@list.ru Author's articles Petromagnetic Indicators of Layers with High Concentration of Cosmogenic Substance in Maastrichtian of Volga Region and Cis-Caspian Region