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卫冕夺冠！中国获第11颗“金钉子”，世界排名第一！
source link: https://tech.sina.com.cn/d/i/2018-07-06/doc-ihexfcvk2826157.shtml
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来源：科学大院地球形成46亿年以来，沧海桑田，在原始的地壳上，慢慢覆盖起层层的岩石，在地质学上，这些岩石便是地层。每一个地层都有其相应的地质年代，如何确立每一段特定地质历史的全球标准？“金钉子”这一概念应运而生。“金钉子”，全球年代地层单位
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