The Cambrian Period began about 542 million years ago.

The Cambrian Period lasted from about 542 milion years (mya) to about 488 mya.

The Cambrian is the first geological period of the Paleozoic Era.

The period was established by Adam Sedgwick, who named it after Cambria, the Latin for Wales, where Britain's Cambrain rocks are exposed the best.

The Cambrian is divided into four epochs.