Cambrian Period

The Cambrian Period was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 55.6 million years from the end of the preceding Ediacaran Period 541 million years ago to the beginning of the Ordovician Period 485.4 mya. Its subdivisions, and its base, are somewhat in flux.

Start Date: 541 million years ago

End Date: 485.4 million years ago