Tselmovich Vladimir Anatolievich RussiaBorokGeophysical Observatory Borok, Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences , 152742, Borok village, Nekouz district, Yaroslavl region.senior researchertselm@mail.ru Author's articles Petromagnetic Indicators of Layers with High Concentration of Cosmogenic Substance in Maastrichtian of Volga Region and Cis-Caspian Region