28A.E. Gusick and M.K. Faughttiming of an initial human migration into the New World remain in discussion (Adovasio et al. 1978; Barton et al. 2004; Bradley and Stanford 2004; Faught 2008; Gruhn 1988), a Pleistocene Pacific coastal migration has been hypothesized to have occurred before 13,000 cal BP, when sea levels were lower than today (Dixon 2001; Faught 2008; Fladmark 1979; Mandryk et al. 2001; Waters and Stafford 2007).