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Trilobites were the dominant species during the Cambrian Period, 540 to 490 million years ago. Credit: Bill Frische | Shutterstock. View full size image. The Cambrian Period is the first geological time period of the Paleozoic Era (the âtime of ancient lifeâ). This period lasted about 53 million years and marked a dramatic burst of evolutionary changes in life on Earth, known as the Cambrian Explosion..
The Cambrian was a time of mild, equitable climate, when high sea levels covered extensive continental margins. Sediments deposited on the margins of one of the Cambrian continental masses, Avalonia, now form the type section in Wales. Modern dating techniques have shown that the Cambrian was of shorter duration than previously thought: the currently accepted duration is ~56 Ma, from 541 to ~485 Ma ago.