Stratigraphy
Ordovician
25
Stratigraphy
Index
Index add'l
Type
Rank
Scope
Belongs to
Age (Ma)
Age
Base
Top
Lower Ordovician
O1
O1
chronostratigraphy
Series
global
Ordovician485.4470.0
Middle Ordovician
O2
O2
chronostratigraphy
Series
global
Ordovician470.0458.4
Upper Ordovician
O3
O3
chronostratigraphy
Series
global
Ordovician458.4443.8
25
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