This sample comes from initial salvage excavations in the East Locus at Los Pozos. The reliability of this date has been questioned by Gregory (2001), and Mabry (2005:115) points out that there was no 13C/12C measure provided. Because the sample size was so small, extended counting was required. For these reasons, and because it is seven centuries earlier than the earliest of a suite of more than 50 subsequent AMS maize dates obtained from all loci at the site, we exclude it from calibration analysis (See also Merrill et al. 2009).