To the question why we do not find rich fossiliferous deposits belonging to these assumed earliest periods prior to the Cambrian system, I can give no satisfactory answer.
对于为什么我们没有发

的属于这个比寒武纪还要早的时期的
石,我无法给出满意的答
。
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济学人-科技
奇迹 There, 8,000 feet above sea level, he found a shale outcrop, about the length of a city block, containing an unrivaled array of fossils from soon after the moment when complex life burst forth in dazzling profusion-the famous Cambrian explosion.
在海拔2438米
地方。他发
了一个页岩露头,长度大约相当于城市
一个街区,里面蕴藏着一大批化石,远自复杂生命大爆爱——即著名
寒
大爆发——之后不久
时候。
济学人-科技
济学人-科技 For instance, it cannot be doubted that all the Cambrian and Silurian trilobites are descended from some one crustacean, which must have lived long before the Cambrian age, and which probably differed greatly from any known animal.
例如,毫无疑问,所有
寒
和志留
三叶虫都是某种甲壳类动物
后代,这种甲壳类动物一定生活在寒
之
很久, 而且可能与任何
知动物都大不相同。
教育(中)