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Macrostrat
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Albertella
524
Type
Zone
Age range
507.3–506.6
Ma
International Timescale
Series 2
Stage 4
Trilobite Zonation - Laurentia
Ptychagnostus praecurrens
Albertella
Plagiura-Poliella
507.3
507.3
507.2
507.1
507.1
507.1
507.0
506.9
506.9
506.9
506.8
506.8
506.7
506.6
506.6
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