Before revision: The other sources are in Stalinsk (Kuznets), Lenin-Kuznets, Kemerovo, Anzhero-Sudzhensk, Chernogorsk, and Cheremkhovo In Siberia, a huge amount of Palaeozoic coal was set on fire and destroyed at the end of the Permian period when the Siberian traps flood basalt erupted through coalfield URL
After revision: The other sources are in Stalinsk (Kuznets), Lenin-Kuznets, Kemerovo, Anzhero-Sudzhensk, Chernogorsk, and Cheremkhovo In Siberia, a huge amount of Palaeozoic coal was set on fire and destroyed at the end of the Permian period when the Siberian traps flood basalt erupted through coalfield areas.