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 the coalfield URL This caused deposition of much fly ash in sediments across the world.
After revision: The or 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 the coalfield URL This caused deposition of much fly ash in sediments across the world.