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Hueyatlaco

Valsequillo Basin site near Puebla, Mexico, where 1981 dating implied stone tools up to about 250,000 years old; rejected by most archaeologists as incompatible with the tools' modern typology. Location approximate: pinned on the Valsequillo reservoir south of Puebla (dam at 18.9126/-98.1084, es.wikipedia Presa Manuel Avila Camacho); the Wikidata coordinate of Q2312036 was rejected, it lies 109 km NNE in Zacatlan, a conflation with the Hueyatlaco ravine (review Luna, 2026-09-17).

Dated events and their evidence

• about 248,000 years ago speculative
  Uranium-series and other dating of ash/lakebeds bracketing stone tools at up to ~250,000 years (Steen-McIntyre, Fryxell & Malde, 1981, Quaternary Research); rejected by most archaeologists as implausible source

Where

18.9300° N, 98.1500° W

Sources

• https://doi.org/10.1016/0033-5894(81)90124-1
• https://en.wikipedia.org/wiki/Hueyatlaco

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