Hamada Nadia RussiaKazanKazan Federal University, 4/5, Kremlevskaya St., Kazan, 420008, Russianadia.m.hamada@gmail.com Author's articles Paleogene quartz sandstones of the Sosnovka Formation of the Uljanovsk-Syzran Volga region (Eastern Russian Platform): Mineral composition and origin Lithofacies interpretation at the upper part of the Pokurskaya formation in the Cenomanian succession, the north of the West Siberian Basin