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.
STORY
Ordovician–Silurian Extinction: Ice Strikes the Seas
By Michael Alan Prestwood
Mon 13 Apr 2026
Published 21 hours ago.
Updated 21 hours ago.
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Ordovician–Silurian Extinction: Ice Strikes the Seas
~444 Million Years Ago
Cause: Global Cooling and Falling Seas
— map / TST —
Prestwood writes on science-first philosophy, with particular attention to the convergence of disciplines. Drawing on his TST Framework, his work emphasizes rational inquiry grounded in empirical observation while engaging questions at the edges of established knowledge. With TouchstoneTruth positioned as a living touchstone, this work aims to contribute reliable, evolving analysis in an emerging AI era where the credibility of information is increasingly contested.
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