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The Cambrian stretched from 541,000,000 BCE to 485,400,000 BCE.
That's more than twice as old as the first Dinosaur
There was six times the pre- industrial amount of Carbon Dioxide in the air, and two thirds of today's oxygen levels.
The Early Cambrian (541-509 mya) kicked off with what is now known as the Cambrian Explosion
The Middle Cambrian saw the formation of the Burgess Shales, a dig site in Canada.
Pikaia, a distant relative of vertebrates with a primitive spinal column.
Hallucigenia, a bizzare creature with spikes on its back, originally presumed to be legs
Marella, a spiky arthropod that swam the Cambrian seas
For example, although octopuses and land snails didn't evolve until later, definite members of their class are first found here.