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References
Grand Canyon Explorer. (2000). Retrieved April 10,2014 from http://www.bobspixels.com/kaibab.org/geology/gc_layer.htm
Grand Canyon national park Arizona. (2005). Retrieved April 10,2014, from http://www.nature.nps.gov/geology/parks/grca/index.cfm
Grand canyon rocks [PDF file]. (n.d.). Retrieved from http://www.nps.gov/grca/forteachers/upload/GeoArticle-2.pdf
(J. Spencer, personal communication, April 18, 2014)
NOVA. (2006). The Grand Canyon: How it Formed [Video file]. Retrieved from http://www.pbslearningmedia.org/resource/ess05.sci.ess.earthsys.canyon/the-grand-canyon-how-it-formed/
Ranney, W. (n.d.). How old is the Grand Canyon. Retrieved April 5, 2014, from http://geology.com/articles/age-of-the-grand-canyon.shtml