Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia) - Kotik, Ivan S. (Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences) ; Zhuravlev, Andrey V. (Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences) ; Maydl, Tatiana V. (Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences) ; Bushnev, Dmitriy A. (Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences) ; Smoleva, Irina V. (Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences)