Teaching relative age dating
The oldest fossil evidence of multicellular animals, or , is burrows that appear to have been made by smooth, wormlike organisms.
Such trace fossils have been found in rocks from China, Canada, and India, but they tell us little about the animals that made them apart from their basic shape.
These "modern" organisms appear relatively quickly in the geological time scale, and their abrupt appearance is often described as the "Cambrian explosion" however, bear in mind that the fossil record of the "explosion" is spread over about 30 million years.
I keep taking things out of brackets because it is interesting relevant and memorable One of the most famous assemblages of Cambrian fossils comes from the Burgess Shale of British Colombia.
In fact, the name "Proterozoic" means "early life".
Plants and animals both owe their origins to are more similar to those of bacteria than to the ribosomes found in the eukaryote cell's cytoplasm; and like chloroplasts they are enclosed by a double membrane as would be expected if they derived from bacterial cells engulfed by another cell. And that is where they remained for at least 600 million years.
As a group, Ediacaran animals had a flat, quilted appearance and many showed radial symmetry.
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