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
为什么我们没有发现大量的属
这个比寒武纪还要早的时期的
石,我无法给出满意的答案。
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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
个页岩露头,长度
约相当于城市
个街区,里面蕴藏着
批化石,远自复杂生命
爱——即著名
寒武

发——之后不久
时候。
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
寒武
和志留
三叶虫都是某种甲壳类动物
后代,这种甲壳类动物
定生活在寒武
之前很久, 而且可能与任何已知动物都
不相同。
教育(中)