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Stratigraphy
Lower Ordovician
Stratigraphy
Index
Index add'l
Type
Rank
Scope
Belongs to
Age (Ma)
Age
Base
Top
Tremadocian
chronostratigraphy
Stage
global
Lower Ordovician485.4477.7
Floian
chronostratigraphy
Stage
global
Lower Ordovician477.7470.0
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