Teotihuacán was probably laid out from its inception according to a master plan intended to express a specific worldview in material form. It is argued that a proposed measurement unit of 83 cm reveals mesoamerican calendrical numbers such as 52 (x 10), 73, 260, 584, and 819, when applied to city axes and major monuments. The channelized Río San Juan divides the central zone into two sections: the watery underworld to the south, especially represented at the Ciudadela, and to the north the earthly representation of the passage from the underworld to the heavens, where the Sun Pyramid at the center symbolizes a sacred time bundle in the 260-day ritual calendar. The sacrificial burial complex found at the Feathered Serpent Pyramid seems to have been a part of the city-foundation program, and the iconography of the pyramid apparently commemorated this dramatization of the creation of time and space.

Compositional and stylistic analyses of decorated ceramics have provided information about the regional organization of economic systems in the Aztec empire’s core zone, the Basin of Mexico. Late Aztec Black-on-orange ceramics (A. D. 1350–1520) are found at nearly all archaeological sites in the Basin of Mexico, but prior to this study their sources were not verified. This study has investigated whether Black-on-orange ceramics were produced in one or many areas in order to define in greater detail dependent communities’ economic relations with the Aztec empire’s capital. To identify production areas, paste compositions of 85 Late Aztec Black-on-orange ceramic samples were compared using neutron-activation analysis. The analysis distinguished three different production areas in the eastern and southern parts of the Basin of Mexico, indicating that Late Aztec Black-on-orange ceramics represent a style adopted by regional manufacturing centers, and are not products of a single center. Because a number of decorative motifs are exclusive to particular paste groups, the sources of some Black-on-orange vessels can now be identified visually.

The consumer aspect of stone-tool manufacture is an important factor for lithic studies concerned with craft specialization and exchange systems. The dynamic nature of stone-tool production/exchange/use systems can be understood through a technological analysis of producer site assemblages and a functional and technological examination of consumer sites. Chipped-stone assemblages from the producer site of Colhá, Belize, and the consumer site of Santa Rita Corozal, Belize, indicate opposing but interdependent roles within the same exchange system. Preclassic formal tools such as the oval biface and stemmed macroblade were manufactured at workshops in Colhá and exhibit a high degree of specialization and standardization in manufacture. These formal tools were then exchanged beyond the chert-bearing zone of northern Belize to consumer sites such as Santa Rita. Once these formal tools entered the consumption sphere they were used, broken, discarded, or recycled into a variety of second-order expedient tools.

La región pacífica de Colombia presenta numerosas áreas inexploradas a lo largo de su litoral costero y tierras bajas. La región sur es la más conocida gracias a la importancia arqueológica de las zonas de Tumaco y La Tolita (Ecuador). Al norte de Tumaco recientemente se exploró la región del bajo Río Patía (Nariño). A traves de este trabajo se observaron asentamientos precolombinos relacionados con dos fases culturales: (a) fase Buena Vista y (b) fase Maina. Los pobladores precolombinos de estas fases se adaptaron básicamente a las áreas bajas de la llanura aluvial selvática y la región costera del sur de Colombia. Hacia finales del período de Desarrollo Regional costero, la fase Buena Vista (ca. 70–500 D.C.) culturalmente se encuentra relacionada con las fases tardías de El Morro y El Balsal de la secuencia establecida para la región de Tumaco (Nariño). Estas fases a su vez forman parte del período tardío “decadente” de la tradición Tumaco-La Tolita (ca. 400 A.C.-500 D.C.) de la costa sur de Colombia y norte del Ecuador. Igualmente, la fase Buena Vista se relaciona con la fase Guadual (ca. 200–600 D.C.) de la cuenca de los ríos Santiago y Cayapas, en el norte de la costa ecuatoriana. Posteriormente, la llegada de nuevos grupos al bajo Patía se representa por asentamientos de la fase Maina datados hacia el 880 D.C., hasta, probablemente, el contacto europeo. Esta fase se caracteriza primordialmente por una industria alfarera sencilla y poco decorada en relación con la cerámica de la fase anterior. Algunos de los sitios tardíos a su vez podrían corresponder a asentamientos de grupos Sindagua que ocuparon el área al tiempo de la Conquista y la Colonia, en los siglos XVI y XVII.