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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..
Cambrian Explosion. âCambrian explosionâ refers to the great quantity and diversity of life found in what is called the Cambrian layer of the geologic column. The Cambrian age in the geologic time scale is dated by scientists as being about 530 million years old. What is really interesting is not just what is found in this layer, but what is found in the layers above it, and what is not found in layers under it. The Cambrian layer has virtually every phyla known to man.