Desecration of Punta de Chimino's ceremonial precinct around a.d. 430 was associated with the appearance of green Pachuca obsidian, pyrite mirror fragments, dart points, a Tikal-style vessel cache, and a peculiar grave with Mexican semblances. A structurally housed Protoclassic stela was removed in an apparent fire ritual and monumental masks adorning the E-Group range building were effaced in a termination rite involving large quantities of refuse. Disuse of the E-Group range building and unfinished refurbishment of the observatory pyramid suggest the site was promptly deserted. The forsaking of this time-honored ceremonial place coincided with reduced settlement in the Petexbatun region and abandonment of the nearby Pasión centers of Ceibal, Itzan, and Chaak Ak'al. Punta de Chimino's findings shed further light on these abandonments, suggesting that they were triggered by amplified central lowland involvement in Pasión River affairs by the end of the fourth century a.d.
ABSTRACT. Bayesian analysis of 6 radiocarbon and 2 luminescence determinations from Punta de Chimino's acropolis provides subcentury Chronometrie accuracy for a Protoclassic hiatus and a more decisive, incipient Early Classic abandon ment. For the latter event, sensitivity tests and a redundant modal value pattern reduce the period of historical interest from a few centuries to several decades. The findings aid in selecting between 2 historical scenarios and demonstrate that improved chronological accuracy is attainable for sites and contexts lacking calendrical dates.
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