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Intervals
Macrostrat
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Richmondian
160
Type
Age
Age range
449–445.2
Ma
International Timescale
Late Ordovician
Hirnantian
Katian
COSUNA
Richmondian
Maysvillian
North American Regional
Gamachian
Richmondian
Maysvillian
449.0
448.8
448.6
448.4
448.2
448.0
447.8
447.6
447.4
447.2
447.0
446.8
446.6
446.4
446.2
446.0
445.8
445.6
445.4
445.2
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