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Search 3,721 documents across 34 fields — every claim tier-rated by evidence

3,721 Documents 34 Sections 43,625 Citations 34,852 Keywords Indexed 4 Evidence Tiers

3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.

2 results for "brachiopod"

E_5_02 Verified Cataclysms & Chronology

E_5_02 — The Ordovician-Silurian Mass Extinction

The Late Ordovician mass extinction (c. 445–444 million years ago, at the Ordovician-Silurian boundary) was the second-most severe extinction event in Earth's history in terms of percentage of species lost — approximatel

Ordovician Silurian mass extinction Hirnantian glaciation Late Ordovician graptolites

E_5_05 Verified Cataclysms & Chronology

E_5_05 — Late Devonian Mass Extinction: Kellwasser and Hangenberg Events

The Late Devonian mass extinction (~372–359 Ma) was not a single catastrophe but a series of extinction pulses spanning approximately 25 million years, making it unique among the "Big Five" mass extinctions. The two most

mass extinction Devonian Kellwasser Hangenberg reef collapse anoxia

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