ナショナルジオグラフィックのインスタグラム(natgeo) - 1月7日 22時06分

Photo by Robbie Shone @shonephoto | Geologist Yuri Dublyansky collects samples of rare cryogenic cave calcites (CCC’s) from inside Rainbow Hall in Shulgan-Tash (Kapova) cave. These rare crystals formed when this part of the Ural Mountains, Russia, were in conditions of permafrost and the temperature in the cave was below 0’C. Uranium-thorium dating demonstrated that such conditions occurred in the Southern Ural Mountains some 37,000 years ago.

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