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Obsidian from two sources in highland Guatemala has been found at 23 sites of the Classic Mayan civilization, mainly in the nonvolcanic lowlands to the north. The distribution, together with trade routes suggested by topography and documentary sources, suggests efficient waterborne transport and competition between sources for the lowland market.

Calibrated radiocarbon dates of 19 samples excavated since 1976 at the site of Cuello, in northern Belize, place the Swasey phase (11 dates) and Bladen phase (8 dates) in the Middle Formative period, rather than in the Early Formative, as 10 dates on charcoal excavated in 1975 and 1976 indicated. The post-1976 dates for both phases fall between about 1100 and 400 B.C., and the two sets do not appear to differ significantly. All except 3 of the 35 archaeologically acceptable dates from the later Lopez Mamom and Cocos Chicanel contexts fall within the conventionally accepted ranges for those phases. A mixture of old charcoal from the environment or from an unidentified pre-Swasey occupation with the 1975–1976 samples may explain their early radiocarbon ages, although why such mixing should have affected only the 1975–1976 samples is not known. This reassessment of the early Cuello sequence aligns it with comparable cultural developments elsewhere in the Maya area and suggests that the earliest farming communities of northern Belize perhaps derived from the highlands of Guatemala.

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