This extinction hit marine life hard, especially organisms living in shallow seas. The leading explanation centers on glaciation over Gondwana, falling sea levels, and disrupted ocean habitats. As seas withdrew, vast marine ecosystems collapsed, clearing space for new evolutionary paths in the Silurian.
Ordovician–Silurian Extinction: Ice Strikes the Seas
~444 Million Years Ago
Cause: Global Cooling and Falling Seas
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