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Wikiwand
25 天
元古宙
元古宙的英文名称Proterozoic源自希腊语词根protero-(意思是“更早”)与zoic-(意思是“动物”),因为其是生命史上奠定生物演化方向的重要时期——能屏障紫外线照射地表的臭氧层成形于元古宙,地球历史上对生物圈造成重创并迫使生物多样性彻底大洗牌的 ...
Wikiwand
29 天
元古宙
元古宙前半时间占支配地位的是哥伦比亚大陆。形成于20亿-18亿年前,在13亿年前解体。罗迪尼亚大陆存在于新元古代(11.5亿到7亿年前),以劳亚大陆(今北美大陆)为核心,格林威尔造山运动(英语:Grenville orogeny)形成了阿巴拉契亚山脉。
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