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International chronostratigraphic chart: Ordovician

Based on the 2024 version. Thumbnail: Aegirocassis Benmoulai (Shoutout to Peter Van Roy)
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ArneWi
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Last updated: December 18, 2025
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First submittedDecember 18, 2025
Times taken2
Average score100.0%
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System / Period
Series / Epoch
Stage / Age
Numerical age (Ma)
Ordovician
Lower
Tremadocian
486.85 ± 1.5
Floian
477.1 ± 1.2
Middle
Dapingian
471.3 ± 1.4
Darriwilian
469.4 ± 0.9
Upper
Sandbian
458.2 ±0.7
Katian
452.8 ±0.7
Hirnantian
445.2 ±0.9
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