This 44-page e-Book (PDF format) gives you the information to tell the story of the coming of life and to update your timeline of life and the "Clock of Eons." It is based on the current timescales from the United States Geologic Survey and the International Commission on Stratigraphy. The information includes an overview of paleogeography and paleoclimate. The descriptions of life include lineages and relationships. Information on mammals is extensive and will help you tell the story of Cenozoic life. There is an introduction that includes important basic concepts and a listing of books and websites for children and for adult background. It was updated in 2019 to include recent paleontology discoveries.