寒武纪 Cambrian ; [地质] Cambrian period ; The Cambrian Age ; fayewong-cambrian
前寒武纪 [地质] Precambrian ; cryptozoic ; pre cambrian era ; Pre-Cambrian period
寒武纪生命大爆发 Cambrian Explosion ; CambrianLife'sExplosion
始寒武纪 eocambrian ; infracambrian ; [地质] Eocambrian period
次世寒武纪 Neocambrian
前寒武纪研究 Precambrian Research
前寒武纪地盾 Precambrian shield
动物学家们会知道寒武纪大爆发时期的进化顺序吗？
Will zoologists ever know the evolutionary sequences in the Cambrian explosion?
石英是石英——由四个氧离子围绕的硅离子——200万年前的更新世石英和5亿年前的寒武纪石英之间没有任何区别。
Quartz is quartz—a silicon ion surrounded by four oxygen ions—there's no difference at all between two-million-year-old Pleistocene quartz and Cambrian quartz created over 500 million years ago.
然而，使所有的黑土形成冰川作用的问题是，在前寒武纪沉积物中广泛分布有黑土。
The problem with ascribing all tillites to glaciation, however, is that tillite deposits are widespread in Precambrian sediments.
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