Virtual Ichnology The evolution of trace fossils through geological time is an ideal model problem for experiments in Artificial Life. In a series of experiments, a community of detritus feeders were simulated in a computer. The individuals in each generation are subject to selection based on the success of their feeding strategies. Mutation and sexual reproduction are also simulated, causing an ...

Oldest Metazoans In the March 1995 Geology, Breyer, Busbey, Hanson and Roy published an article about mesoproterozoic (ca. 1.25 GA) trace fossils from the Van Horn region of Texas. On this page are color and grayscale images of the fossils. In the article we made a case for these being trace fossils. Others have suggested Vendian-type body fossils or some bizzare and unique cyanobacteria.