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Intervals
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Undillan
997
Type
Age
Age range
503–500.5
Ma
International Timescale
Miaolingian
Guzhangian
Drumian
New Zealand Ages
Boomerangian
Undillan
Floran
Australian Regional
Boomerangian
Undillan
Floran
503.0
502.8
502.6
502.4
502.2
502.0
501.8
501.6
501.4
501.2
501.0
500.8
500.6
500.4
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