奥陶纪
奥陶纪（英语：Ordovician，符号O）是地质时代中显生宙古生代个第二个纪，约开始于4.85亿年前，结束于4.43亿年前。“奥陶”（Ordovices）个名字来自英国威尔士一古代凯尔特人部落奥陶维斯人，后被地质学家查尔斯·拉普沃思用来作地质年代名。
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