Overview Other than masonry encountered in test units, the majority of the project’s contributions to Middle Preclassic period architecture was found at Nixtun-Ch’ich’. The Urban Grid, Nixtun-Ch’ich’ Nixtun-Ch’ich’, Shadow Map, December 2014 Masonry Characteristics Micro-stratigraphy of a Preclassic Construction Thin Plaster on a Preclassic Period Construction