1997  Popov & Kuzina: 29. Collection G.I. Vodorezov 1939 in
           the Dombarovskii region at locality 1079 NW of the
           well Maldygul-Sai, Kamsak River, upper part of
           Tournaisian, Kugutyk Fm. overlaying the coal-bearing
           Dombar Fm.