SciencePermian-Triassic boundary (~252 million years ago)Siberia (Siberian Traps), global impacthigh confidence

Massive volcanism 252 million years ago caused rapid environmental change that eliminated most animal species on Earth.

Notes on verification

Well-supported by multiple peer-reviewed and authoritative sources (NASA, Nature, MIT, Britannica) confirming the Siberian Traps volcanism as the primary driver of the Permian-Triassic extinction event, the largest mass extinction in Earth's history. [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=0.94 clusters=5 claim_tier=notable]

Sources