“…Stable carbon and nitrogen isotope analysis has been applied in a number of archaeological settings to examine the relative contribution of marine versus terrestrial resources to the diet (Ambrose et al, 1997;Chisholm et al, 1982Chisholm et al, , 1983Coltrain, 2009;Coltrain et al, 2004;Keegan and DeNiro, 1988;Richards and Hedges, 1999;Schoeninger et al, 1983;Walker and DeNiro, 1986). Previous isotopic research in California has focused on human paleodiets along the Santa Barbara Channel of southern California (Goldberg, 1993;Harrison and Anne Katzenberg, 2003;Walker and DeNiro, 1986), Monterey Bay (Jones, 1996;Newsome et al, 2004), the San Francisco Bay Area (Bartelink, 2009;Beasley et al, 2013;Gardner et al 2018), and the Sacramento-San Joaquin Delta region (Bartelink, 2006;Eerkens et al, 2013a).…”