Neoproterozoic trace fossils give us the earliest signs of animals moving on or just below the sea floor typically in the form of small horizontal unbranched trails and furrows. Despite their modest appearances, these trace fossils are important in that they provide an undisputable minimum age for the appearance of bilaterian animals. Remarkable are the recent discoveries of the Ediacaran organisms, Kimberella and Dickinsonia, in association with their trace fossils. These associations suggest exploitation of microbial mats, and a similar behavior probably explains also the simple horizontal Neoproterozoic trace fossils.
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