Silurian

(noun.) from 425 million to 405 million years ago; first air-breathing animals.

艾伯纳录入

• There are three great series of strata beneath the Silurian system in Canada, in the lowest of which the Eozoon is found. 查尔斯·达尔文. 物种起源.
• Murchison at their head, were until recently convinced that we beheld in the organic remains of the lowest Silurian stratum the first dawn of life. 查尔斯·达尔文. 物种起源.
• We will suppose the letters A to L to represent allied genera existing during the Silurian epoch, and descended from some still earlier form. 查尔斯·达尔文. 物种起源.

校对:普拉特