Early occupation at Nixtun-Ch'ich’, on the western edge of Lake Petén Itzá, is dated by two ceramic complexes, K'as and Chich. These represent the Late and Terminal Early Preclassic or the early and late “Pre-Mamom” periods, respectively (ca. 1300–800 BC), including a “Transitional” period incorporating Nix Middle Preclassic (Mamom) pottery. Comparisons with complexes at other sites in the region permit the dating of 10 construction loci, including 3 in the civic-ceremonial core. Low late Pre-Mamom platforms were raised and expanded in Transitional and Early Middle Preclassic times, when they were elaborated into two E-Groups and a Triadic Structure on the central axis. This building activity is interpreted in terms of cooperative or corporate labor organization and related to evolutionary game theory. The ritual foundation of such organization is evident in the site's gridded layout based on a mythical world-creation crocodile.
