This period, which began about 541 million years ago, is often referred to as the "Cambrian Explosion" due to the rapid diversification and evolution of life forms, leaving behind a rich fossil record.
Before the Cambrian, life was primarily simple and soft-bodied, leaving few traces in the fossil record. The emergence of hard shells, skeletons, and other durable structures in the Cambrian allowed for better fossilization, making it the era where we see a dramatic increase in fossil evidence.
