Geologic Time Scale: Cambrian Period
The Cambrian Period is the first geologic time period of the Paleozoic Era in the Phanerozoic Eon. The Cambrian started after the end of the Precambrian 538 million years ago. When the Cambrian Period came to the end about 485 million years ago starting the Ordovician.
Established by Adam Sedgwick the name Cambrian stems from the “Cambrian series” meaning Cambria which is Latin for ‘Cymru’ translating to Wales.