现代世界的前兆
This Lagersttte has yielded many previously unknown species, including microscopicsponges, small tubular organisms of unknown nature, things that look like jellyfish but mightnot be and a range of what appear to be embryos that show bilateral symmetry.
这个生物群落发现了许多之前不知道的物种,包括微型海绵生物,不知名物种的小管器官,一些似是而非的软体动物,以及一些有对称结构的像是胚胎的生物。
What these embryos would have grown into is unclear. But some might be the ancestors ofthe Cambrian megafauna.
这些胚胎将会长成什么不得而知,但是他们中的一些可能就是寒武纪大型动物的祖先。
To try to link the evolution of these species with changes in the environment, Chu Xueleiof the Institute of Geology and Geophysics in Beijing and his colleagues have been looking atcarbon isotopes in the Doushantuo rocks.
为了把这些物种的进化和环境变化联系起来,北京地质与地球物理研究所的储雪雷和他的同事用碳同位素方法测试陡山沱石块。
They have found that the proportion of 12Ca light isotope of carbon that is more easilyincorporated by living organisms into organic matter than its heavy cousin, 13Cincreasedon at least three occasions during the Ediacaran period.
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