The first period of the Paleozoic and of the Phanerozoic eon, named for Cambria (Wales), where its rock sequences were first studied. It opens with the most rapid diversification of complex animal life the fossil record shows. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
Start (Million Years Ago)Revised in early 2022 from the earlier figure of 541 Mya per the cited article. End (Million Years Ago)Cambrian-Ordovician boundary, ICS standard value. Key EventThe Cambrian explosion: the rapid appearance in the fossil record of most major hard-bodied animal groups alive today. 1 Connections
Has Geologic Rank
In Discipline
Source Geologic Time Scale (Wikipedia)
Precursor To
Sources
1. Geologic Time Scale (Wikipedia)
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