Did the Cambrian explosion actually occur?

A cursory flip by way of any highschool biology textbook will inevitably floor a point out of the Cambrian explosion, a interval about 540 million to 520 million years in the past throughout which many animal teams first sprang into life and diversified. The occasion is often described as fast and prolific, evoking a chaotic second in early evolutionary historical past. 

However was there actually a dramatic burst of biodiversity on Earth throughout this time? 

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