Lexicon
Intervals
Macrostrat
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Stage 3
254
Type
Age
Age range
521–514.5
Ma
International Timescale
also
International Ages
Cambrian
Series 2
Stage 4
Stage 3
Terreneuvian
Stage 2
521
521
520
520
519
519
518
518
517
517
516
516
515
515
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