The Very Extra Ordinary on Instagram: "The Cambrian period is the first geological period of the Paleozoic Era. It lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 million years ago to the beginning of the Ordovician Period 486.85 million years ago. The Cambrian marked a profound change in life on Earth; prior to the Period, the majority of living organisms were small, unicellular and poorly preserved. Complex, multicellular organisms gradually became more common d