Websites
http://www.newworldencyclopedia.org/entry/Cenozoic
http://www.infoplease.com/encyclopedia/science/cenozoic-era.html
http://www.encyclopedia.com/topic/Cenozoic_era.aspx
http://www.universetoday.com/47473/cenozoic-era/.
http://www.ucmp.berkeley.edu/cenozoic/cenozoic.php
http://www.prehistory.com/timeline/quatern.htm
http://www.fossils-facts-and-finds.com/tertiary_period.html
http://www.fossils-facts-and-finds.com/silurian_period.html
http://www.ucmp.berkeley.edu/paleozoic/paleozoic.php
http://www.geo.msu.edu/geogmich/Precambrian.html
http://www.enchantedlearning.com/subjects/dinosaurs/mesozoic/
http://www.infoplease.com/encyclopedia/science/cenozoic-era.html
http://www.encyclopedia.com/topic/Cenozoic_era.aspx
http://www.universetoday.com/47473/cenozoic-era/.
http://www.ucmp.berkeley.edu/cenozoic/cenozoic.php
http://www.prehistory.com/timeline/quatern.htm
http://www.fossils-facts-and-finds.com/tertiary_period.html
http://www.fossils-facts-and-finds.com/silurian_period.html
http://www.ucmp.berkeley.edu/paleozoic/paleozoic.php
http://www.geo.msu.edu/geogmich/Precambrian.html
http://www.enchantedlearning.com/subjects/dinosaurs/mesozoic/
Books
California Life Science. Evanston, IL: McDougal Littell by: Albanese, Ernest, Scott Andrews, Carole Anson, and Becky Barra