A. O. Ivanov
St. Petersburg University; Kazan Federal University
Russian Federation

Ivanov Alexandr Olegovich, PhD in Geology and Mineralogy, Associated Professor, Department of Sedimentary Geology, Institute of Earth Sciences; Senior Research Fellow, Laboratory of Stratigraphy of Oil and Gas Bearing Reservoirs, Institute of Geology and Petroleum Technologies,

Universitetskaya nab., 7/9, St. Petersburg, 199034;

Kremlevskaya ul., 18, Kazan, 420008.

N. G. Izokh
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences
Russian Federation

Izokh Nadezhda Georgievna, PhD in Geology and Mineralogy, Senior Research Fellow, Laboratory of Paleozoic Paleontology and Stratigraphy,

Akademika Koptyugina pr., 3, Novosibirsk, 630090.