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He did this by the 14C method, using charcoal logs caught up in the deposits or in the burned buried soils at their base. The Caulapan site was situated roughly 5 km northeast of Hueyátlaco, in a remnant deposit of young sediment that had once filled the steep-walled Caulapan barranca. The El Horno site, roughly a kilometre southwest of Hueyátlaco and lower in elevation provided a tooth fragment from a butchered mastodon associated with unifacial tools.


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