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Epoch
2 references
knowledge source
Divisions of geologic time—Major chronostratigraphic and geochronologic units
knowledge source
The Geoscience Ontology reference
previous time interval
Lower Ordovician Epoch
1 reference
knowledge source
Divisions of geologic time—Major chronostratigraphic and geochronologic units
Ordovician Period
1 reference
knowledge source
Divisions of geologic time—Major chronostratigraphic and geochronologic units