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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 "Silurian"

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

P_1_07 Verified Philosophy & Meaning

P_1_07 — Deep Time and Cognitive Limits

This document examines Deep Time and Cognitive Limits, a topic within the Philosophy Meaning research area. Key areas of investigation include Origins of the Concept, The Scale Problem, The "Human Line" Problem. The anal

deep time John McPhee James Hutton Silurian Hypothesis Gavin Schmidt Adam Frank

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