Dzyuba Oksana S. RussiaNovosibirskTrofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, 3, Academician Koptyug Av., Novosibirsk, 630090, RussiaDzyubaOS@ipgg.sbras.ru Author's articles New Paleontological and Stratigraphic Data on the Ryazanian Regiostage in the Oka River Sections (Central Russia)