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2. "Paleogene." Wikipedia. Wikimedia Foundation, 28 Sept. 2013. Web. 01 Oct. 2013.
3. "Earth 50.2 Million Years Ago." 50 Million Years Ago. N.p., n.d. Web. 01 Oct. 2013.
4. "Geological and Biological Timeline of the Earth." Scientific Physic. N.p., n.d. Web. 1 Oct. 2013. <http://www.scientificpsychic.com/etc/timeline/timeline.html>.
5. "Desktop Wallpapers." Free HD for Widescreen, High Definition, Mobile. N.p., n.d. Web. 01 Oct. 2013. <http://wallpaperswide.com/>.
6."Evidence Found For Early Horse Domestication In Kazakhstan." - Science News. N.p., n.d. Web. 01 Oct. 2013.
7. "Work & Travel USA." CIEE-Nonprofit, NGO Leader in International Education and Exchange since 1947. N.p., n.d. Web. 01 Oct. 2013.
8. "Fragile Earth." The Guardian. N.p., n.d. Web. 1 Oct. 2013. <http://www.theguardian.com/environment/gallery/2008/mar/04/fragileearth>
9. "Browsing the "Paleogene" Category." Palaeocast. N.p., n.d. Web. 20 Oct. 2013. <http://www.palaeocast.com/category/cenozoic/paleogene/>.
10. "Modeling Early Paleogene Climate: From the Top of the Atmosphere to the Bottom O."Modeling Early Paleogene Climate: From the Top of the Atmosphere to the Bottom O. N.p., n.d. Web. 20 Oct. 2013. <http://adsabs.harvard.edu/abs/2001PhDT........32H>.
11. "Paleogene." HSU NHM. N.p., 30 Oct. 2012. Web. 20 Oct. 2013. <http://www.humboldt.edu/natmus/lifeThroughTime/Paleogene.web/index.htm>.
12. "Pangea (supercontinent)." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 20 Oct. 2013. <http://www.britannica.com/EBchecked/topic/441211/Pangea>.
13. "Early Hominin Evolution: Discovery of Early Hominids." Early Hominin Evolution: Discovery of Early Hominids. N.p., n.d. Web. 20 Oct. 2013. <http://anthro.palomar.edu/hominid/australo_1.htm>.