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Intervals
Macrostrat
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Olenellus
520
Type
Zone
Age range
515.5–511.1
Ma
International Timescale
Series 2
Stage 4
Stage 3
Trilobite Zonation - Laurentia
Eokochaspis nodosa
Olenellus
Nevadella
515.6
515.4
515.2
515.0
514.8
514.6
514.4
514.2
514.0
513.8
513.6
513.4
513.2
513.0
512.8
512.6
512.4
512.2
512.0
511.8
511.6
511.4
511.2
511.0
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