By the Chinese Academy of Sciences Institute of Geology experts to inspect the cave that:ci dong formed in the Cenozoic Quaternary ice age, about three million years ago, ice cave named years.
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- 经中科院地质研究所洞穴专家现场考察认定:此洞形成于新生代第四纪冰川期,距今约三百万年,故名万年冰洞。