31. References: Wilson Cycle image, North American Craton image, and Digital Shaded relief maps and province descriptions (including images) from the USGS web page: http://wrgis.wr.usgs.gov/docs/parks/province. Accessed 10/25/05http://wrgis.wr.usgs.gov/docs/parks/province Cross sections of orogenies from Prof. Ron Blakey’s (NAU) website: http://jan.ucc.nau.edu/~rcb7/RCB.html. Accessed 12/25/05 http://jan.ucc.nau.edu/~rcb7/RCB.html Paleomaps from Ron Blakey’s website; maps are largely based on work by C. R. Scotese, PALEOMAP Project www.scotese.com.www.scotese.com