Period
O
Ordovician
486.8500 – 443.1000 Ma
The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon. The Ordovician spans 43.75 million years from the end of the Cambrian Period 486.85 Ma to the start of the Silurian Period 443.1 Ma.
← Geological time scale
© Scotese, Christopher R.; Vérard, Christian; Burgener, Landon; Elling, Reece P.; Kocsis, Ádám T. · CC BY 4.0
Parent interval
Paleozoic
Era