Fig. 1 in Volgian and Santonian-Campanian radiolarian events of the Russian Arctic and Pacific Rim

Fig. 1. Location of some radiolarian−bearing source rocks in the Russian Arctic and along the Pacific margins; localities A and B correspond to Fig. 2. 1, Mezen Basin, Pesha section. 2, southeastern Barents−Pechora Basin: 2, Narjan−Mar, borehole 5; 2A, Kolguev, borehole 140. 3. Volga−Pre−Ural Basin: 3, Shilovka section; 3A, Gorodicshe section, Uljanovsk region. 4, Northern and western Siberian basins: 4, Polar Ural, borehole 22; 4A, Upper Salym, borehole 17. 5, western Kamchatka and Chukotka: 5, Palana section; 5A, Omgon; 5B, Semiglawaya Mountains. 6, Sakhalin.