奥陶纪
Ordoviitsium
オルドビス紀
Floian Age
younger bound -443.8 +|-1.5 Ma
Ordovik
a1.1.3.5
Silurian Period
Late Ordovician Epoch
Ordovikas
Cambrian Period
Paleozoic Era
Dapingian Age
Darriwilian Age
Geologic Time Scale (2019)
Hirnantian Age
ordovik
Cambrian Stage 10 Age
ordovícium
Ordoviikki
Ordovician Period
Llandovery Epoch
Ordovician
Base of Ordovician
Ordowik
ordovicij
Katian Age
Ordovizium
Base of Silurian
ordoviciano
Ordovicium
Ordovicium
Ordovicium
older bound -485.4 +|-1.9 Ma
Ордовик
Middle Ordovician Epoch
Furongian Epoch
Phanerozoic Eon
Early Ordovician Epoch
Ordovícico
Ordovícico
Sandbian Age
Tremadocian Age
Ordovicien
ordovicium
Rhuddanian Age