In this website you will learn valuable information about Earth's history. We will provide an in-depth time line about geologic time and mass extinction. There are seven divisions of the geological time scale the longest divisions are eons. There are three eras in Phanerozoic era. Paleozoic era, was dominated by marine animals without backbones. During Mesozoic era is what we usually refer to as the age of the dinosaurs and mammals. The Cenozoic era in other words means “recent life,” that continues today. Mammals and humans that we see today evolve during the recent time.

For more information on the different eras refer to the links below                                                         Phanerozoic  http://en.wikipedia.org/wiki/Phanerozoic                                                                              Mesozoic   http://www.ucmp.berkeley.edu/mesozoic/mesozoic.php                                                           Caenozoic  http://www.livescience.com/40352-cenozoic-era.html