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1 gen 482103507 anni a. C. - 原始的脊椎动物出现奥陶纪的海生生物空前发展，比寒武纪更为繁盛奥陶纪早期首次出现了可靠的陆生脊椎动物——淡水无鄂鱼。

Descrizione:

腕足类生物迅速演化，鹦鹉螺进入繁盛时期，是当时海洋中凶猛的肉食性动物。
https://baike.baidu.com/item/%E5%A5%A5%E9%99%B6%E7%BA%AA/388967?fr=aladdin

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地球地质年代表

8 feb 2020

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1129

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1 gen 482103507 anni a. C.

Adesso

~ 5883516 years ago

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