Kireyenko Olga S. RussiaSaratovLower Volga Research Institute of Geology and Geophysics, Str. Moscow, 70, Saratov, Saratov region., 413503pisarenko@nvniigg.san.ru Author's articles Paleogeographic and Tectonic Environment in the Lower Permian Halogen Formation from the Southeastern Margin of the Russian Plate