The Archaeology, Stratigraphy, and Geochronology of the Hueyatlaco Site, Mexico

Hal Malde was a pioneer in the field of geoarchaeology and worked at many important Paleoamerican sites. In the 1960s, Malde worked with archaeologists Cynthia Irwin-Williams at a number of early sites around the Valsequillo Reservoir, including the important site of Hueyatlaco. At Hueyatlaco, artifacts were found associated with extinct fauna and dated to ca. 20,000 B.P. In the 1970s, Malde, Fryxell, and Steen-McIntyre returned to Hueyatlaco and correlated Malde's regional stratigraphic sequence to the site specific stratigraphy. Dating at the time suggested that the site was 250,000 years old. Malde returned to the site in 2001 and confirmed his stratigraphy and the estimated age for the artifact-bearing deposits. Studies undertaken in 2004, revise the stratigraphy and dating of the site.