14 янв 439000000 г. до нашей эры - Ordovician–Silurian Mass Extinction

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Causes:
Glaciation & Sea-Level Drop – A major ice age, likely triggered by the uplift of the Appalachian Mountains, caused global cooling, glaciation, and a dramatic fall in sea levels, reducing shallow marine habitats.
Anoxia & Climate Change – As ice sheets melted, sea levels rose rapidly, leading to ocean anoxia (low oxygen), further stressing marine ecosystems.

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