The typological, modal, and chemical analyses of the pottery from the Petexbatun region of southwestern Peten, Guatemala, are used to establish a regional ceramic chronology and to assess three theories used to explain the Classic Maya collapse of the ninth and tenth centuries A.D. The three explanations are based on: (1) foreign invasion; (2) commercialization; and (3) internal warfare. Each of these theories suggests different changes in the regional ceramic-production and -exchange systems of the Petexbatun. Shifts in the ceramic production system are monitored using a standardization study, while instrumental neutron-activation analysis (INAA) is used to model changes in interregional exchange. The results of these analyses indicate that there was a continuity in the ceramic assemblage from the Late Classic Nacimiento phase (A.D. 600-830) to the Terminal Classic Sepens phase (A.D. 830-950). Together with little change in architectural, mortuary, and other artifactual styles, this finding suggests that no foreign groups invaded the Petexbatun region, and therefore did not lead to the collapse in the Pasion region. The small decreases in pottery standardization and the minor shifts in interregional exchange do not support the second theory that a major reorganization of Maya economy undercut the power base of the Maya elite class. On the other hand, these small decreases in standardization and in the scale of exchange do support the third theory, which suggests that internal warfare between the regional polities disrupted exchange, leading to more localized production. The stability of the ceramic production and exchange systems in the Petexbatun region throughout the collapse also suggests that the political and economic systems were largely disconnected. These findings suggest that internal political processes leading to an increase in competition and to intensified warfare were important factors in the Classic Maya collapse of the Petexbatun region in Peten, Guatemala.

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The origins and cultural affiliations of the first sedentary agricultural and pottery-producing communities in the southern Maya lowlands remain hotly debated. Here, we describe the discovery of a new early farming settlement at the small site of BuenavistaNuevo San José on Lake Peten Itza in northern Guatemala. Evidence for a pre-Mamom occupation (1000-700 BC) at this site was found in the deepest fill layers overlying bedrock, including pottery diagnostic of this time period and the remains of a postin-bedrock dwelling. Because the evidence for this early settlement is from secondary contexts and because four radiocarbon dates cover a broad chronological range, the best evidence for the pre-Mamom occupation consists of the ceramics recovered in the excavations. The closest links of the pre-Mamom pottery at Buenavista-Nuevo San José are with the Eb complex at Tikal and the Cunil complex of Cahal Pech, Belize, suggesting strong interactions between these early groups. The discovery of preMamom pottery at Buenavista also suggests that the early farmers were more widespread than previously suggested. Furthermore, the presence of Olmecoid symbols incised on the pre-Mamom pottery at Buenavista-Nuevo San José indicates that these early communities were immersed in broad pan-Mesoamerican spheres of interaction.

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