Lower Ordovician
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Stratigraphy | Index | Index add'l | Type | Rank | Scope | Belongs to | Age (Ma) | Age | |||
---|---|---|---|---|---|---|---|---|---|---|---|
Base | Top | ||||||||||
Tremadocian | chronostratigraphy | Stage | global | Lower Ordovician | 485.4 | 477.7 | |||||
Floian | chronostratigraphy | Stage | global | Lower Ordovician | 477.7 | 470.0 |
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