“…The lacustrine origin suggests deposition of the Bouse Formation in a series of lakes that fi lled and spilled from one basin to the next until system was integrated and the Colorado River was a through-fl owing river (House et al, 2005a(House et al, , 2005bSpencer et al, 2005Spencer et al, , 2008. Arguments in favor of a lacustrine origin of the Bouse Formation are based on isotopic analyses (Spencer and Patchett, 1997;Buising, 1990;Poulson and John, 2003;Roskowski et al, 2010;Spencer et al, 2013), step-like maximum elevations of the Bouse paleolakes suggesting that no uplift or southward tilting has occurred since deposition of the unit (Spencer et al, 2008(Spencer et al, , 2013, and sedimentological evidence of fl oodwater infl ux derived from northern sources immediately preceding Bouse Formation deposition in the Mohave and Cottonwood Valleys Spencer et al, 2013).…”