Trace fossils found in rocks are believed to be produced by vermiform organisms with circular in cross section bodies. Click on pictures to enlarge them. All of the rubber worms used in experiments. Notice different body morphologies. A rubber worm is pulled through two different colored layers of watery mixture of plaster of Paris.
Percentages show simulated water content of the substrate.
Rubber worm which produced traces shown above. A bait worm with legs and a tail. The arrow shows the trace it produced. Two rubber worms and traces they produced. Illustration showing earthworms moving to the surface of the plaster mixture.