“…Combined 14 C and OLS dating provided a robust and consistent chronological framework for these phases, which substantially improved the existing chronology based on radiocarbon-dated shell material (Aguayo et al, 1999 Figure 12. Periodicities of beach-ridge formation for the Usumacinta-Grijalva (Us-Gr) system compared with reported or estimated values for other large beach-ridge systems: Rockingham Bay (Forsyth et al, 2010), Beachmere (Brooke et al, 2008b), Moruya (Oliver et al, 2015), Guichen Bay (Murray Wallace et al, 2002;Bristow and Pucillo, 2006), Keppel Bay (Brooke et al, 2008a), Shark Bay (Nott, 2011), Cowley Beach (Nott et al, 2009), Lake Michigan (Thompson, 1992), St. Vincent Island (Lopez and Rink, 2008;Rink and Lopez, 2010), Jerup (Nielsen et al, 2006), Nayarit (Curray et al, 1969), and Rio Grande do Sul (Milana et al, 2017).…”