Worms eat sediment, delineating some sort of path. The 21 November 1969 issue of Science had computer simulations of a few of these worms, in comparison with various fossilized tracks.
Mike Paterson studied these worms, a type of 2D Turing Machine, on an isometric grid. This notebook has more history on these, along with Mathematica code for producing the trails these worms leave behind.
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Worms eat sediment, delineating some sort of path. The 21 November 1969 issue of Science had computer simulations of a few of these worms, in comparison with various fossilized tracks. 
