http://museumvictoria.com.au/melbournem ... ion-years/ (http://museumvictoria.com.au/melbournemuseum/discoverycentre/600-million-years/)
This site was developed by the user ginckgo at http://www.rationalskepticism.org/ (http://www.rationalskepticism.org/) and is well worth a nose around if your interested in how life evolved from 635 million years ago.