Precambrian is a geologic period that extends as back as 4.500 million years ago. Fossils are very rare from that period of time.
stromatolites
Few Fossils exist from this time because the animals were all soft-bodied
There are fewer fossils because there were less animals and also the fossils are so old they are buried deep within the earth.
Actually, it isn't really true! We now know (unlike Darwin who would have rejoiced to know what we now know!) that fossils in the PreCambrian are numerous and spread world-wide. But many are very...
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