a b c

Figure 5: Simple, architecturally unsophisticated animals of the Ediacaran fauna represent the first phase of the radiation of animals. Some of these animals are known only from their burrows (a) and fossil traces (b). Others, such as Dickinsonia (c) are known from their body fossils. (Courtesy of the Smithsonian Institution.)

Information provided by: http://www.sigmaxi.org