Lexicon
Intervals
Macrostrat
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Arenigian
120
Type
Age
Age range
477.1–465.5
Ma
International Timescale
Middle Ordovician
Darriwilian
Dapingian
Early Ordovician
Floian
Tremadocian
Custom COSUNA
Llanvirnian
Arenigian
Tremadocian
COSUNA
Whiterock
Arenigian
Tremadocian
478
477
477
476
476
475
475
474
474
473
473
472
472
471
471
470
470
469
469
468
468
467
467
466
466
465
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