“…angachiensis Vladimirskaya, and Pseudocamarotoechia ubsuensis (Tchernychev). This "Tuvaella" or "Tuva-Mongolian" type of fauna is characterized by endemism in benthic invertebrate groups especially brachiopods, bryozoans, and corals (Modzalevskaya, 1968(Modzalevskaya, , 1977Modzalevskaya, 1969;Chekhovich, 1972a,b;Vladimirskaya, 1978;Kulkov et al, 1985;Vladimirskaya et al, 1986), as well as in pelagic ichthyofaunas (Obruchev, 1956(Obruchev, , 1958(Obruchev, , 1960Obruchev, 1967;Karatajute-Talimaa, 1973Talimaa, 2000;Kurilenko et al, 2002;Karatajute-Talimaa and Ratanov, 2002;Žigaite, 2004, 2013Žigaite and Blieck, 2006;Žigaite and Karatajute-Talimaa, 2008). The Tuva-Mongolian Silurian is inferred to have accumulated in a shallow-water basin (or several basins) with carbonate-terrigenous and mainly redbed sedimentation (Vladimirskaya, 1967(Vladimirskaya, , 1973Vladimirskaya et al, 1986).…”