Time when many different types of creatures appeared on earth it was known as the Cambrian Explosion.
The unprecedented appearance of life during the start of the Cambrian Period, between 541 and about 530 million years ago, is known as the Cambrian explosion. Between 20 and 35 of the major phyla that make up contemporary animal life first appeared during the event, which was marked by their emergence. Because of the comparatively short time span over which this diversity of species develops, this event is frequently referred to as the "Cambrian Explosion." More than 500 million years have passed since the Cambrian explosion. It was a period of rapid proliferation of many types of life on Earth, when the majority of the major animal groupings first began to show up in the fossil record.
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