奥陶纪(5亿1千万年前到4亿3千8百万年前原始的脊椎动物出现奥陶纪（Ordovician period）是古生代的第二个纪，引人注意、鳞木。二叠纪的干燥性气候延续到了早。
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同义词： Ordovician
以上来源于: WordNet
The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life.
美国西部干燥的山脉包含了距今4.4亿至5.1亿年前的奥陶纪岩石，其中充斥着热带海洋生物生存的迹象。
At the end of Ordovician Period, a differential elevation occurred in the central Shanganning Basin due to the Caledonian Movement.
陕甘宁盆地中部气田的主要储气层段为奥陶系马五段的古岩溶层。
Eurypterid: any of various large segmented aquatic arthropods of the order eurypterida that existed from the ordovician period to the Permian period.
(古生)板足鲎目的：一种巨大的、有节的，属于板足鲎目的水生节肢动物，生存于奥陶纪到二叠纪时期。
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