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Intervals
Macrostrat
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Cedaria
528
Type
Zone
Age range
499.2–498.5
Ma
International Timescale
Miaolingian
Guzhangian
Trilobite Zonation - Laurentia
Crepicephalus
Cedaria
Bolaspidella
499.2
499.1
499.1
499.1
499.0
498.9
498.9
498.9
498.8
498.8
498.7
498.6
498.6
498.6
498.5
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