Preservation
The majority of the fossil record consists of the robust matter of decayed corpses. The Ediacaran biota had soft bodies and no skeletons, making their abundant preservation surprising. The absence of burrowing creatures living in the sediments undoubtedly helped. After the evolution of these organisms in the Cambrian, soft-bodied impressions were usually disturbed before they could fossilize.
Read more about this topic: Ediacaran Biota
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—Hendrik Verwoerd (1901–1966)
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