Sources
Works Cited
Hamilton, Jason. "Paleozoic Era, Mesozoic Era, Cenozoic Era." Science Views. Calvin and Rosanna Hamilton, 2005. Web. 11 Nov. 2014.
"Precambrian Eon, Paleozoic Era, Mesozoic Era, Cenozoic Era." PBS. WGBH Educational Foundation and Clear Blue Sky Productions, Incorporated, 2001. Web. 7 Nov. 2014.
Hamilton, Jason. "Paleozoic Era, Mesozoic Era, Cenozoic Era." Science Views. Calvin and Rosanna Hamilton, 2005. Web. 11 Nov. 2014.
"Precambrian Eon, Paleozoic Era, Mesozoic Era, Cenozoic Era." PBS. WGBH Educational Foundation and Clear Blue Sky Productions, Incorporated, 2001. Web. 7 Nov. 2014.