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Intervals
Macrostrat
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Stairsian
514
Type
Age
Age range
480–479.5
Ma
International Timescale
Early Ordovician
Tremadocian
North American Regional
Tulean
Stairsian
Skullrockian
480.02
480.00
479.98
479.96
479.94
479.92
479.90
479.88
479.86
479.84
479.82
479.80
479.78
479.76
479.74
479.72
479.70
479.68
479.66
479.64
479.62
479.60
479.58
479.56
479.54
479.52
479.50
479.48
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