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Bolaspidella
527
Type
Zone
Age range
504.5–499.2
Ma
International Timescale
Miaolingian
Guzhangian
Drumian
Wuliuan
Trilobite Zonation - Laurentia
Cedaria
Bolaspidella
Ptychagnostus gibbus
504.6
504.4
504.2
504.0
503.8
503.6
503.4
503.2
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
500.2
500.0
499.8
499.6
499.4
499.2
499.0
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