三叠纪的 Triassic
- 到目前为止,三叠纪的结束仍被史学界归因于持续了60万年的大规模火山爆发。
Until now, the end of the Triassic has been blamed on massive volcanic eruptions that went on for 600, 000 years. - 只有十分之一的生物物种存活下来,而这些生物在随后的时间里成为了生命重生的基础,这就是所谓的三叠纪时期。
Only one in ten species survived, and these formed the basis for the recovery of life in the subsequent time period, called the Triassic. - 2英寸大小已经灭绝的长有带鳍尾、 脊索和含有细胞质状骨胳的锥形牙齿似鳗的鱼;后寒武纪到后三叠纪的生物;可能是圆口纲脊椎动物的祖先。
small (2 in) extinct eellike fish with a finned tail and a notochord and having cone-shaped teeth containing cellular bone; late Cambrian to late Triassic; possible predecessor of the cyclostomes.
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