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jan 1, 482103507 BC - 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。

Description:

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

By徐康
8 Feb 2020
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Date:

jan 1, 482103507 BC
Now
~ 5883516 years ago

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