Age of Mexican ash with alleged ‘footprints’

Paul R. Renne (), Joshua M. Feinberg, Michael R. Waters, Joaquin Arroyo-Cabrales, Patricia Ochoa-Castillo, Mario Perez-Campa and Kim B. Knight
Additional contact information
Paul R. Renne: Berkeley Geochronology Center
Joshua M. Feinberg: University of California
Michael R. Waters: Texas A&M University
Joaquin Arroyo-Cabrales: Laboratório de Arqueozoología, Subdirección de Laboratórios y Apoyo Académico, Instituto Nacionál de Antropología e Historia
Patricia Ochoa-Castillo: Subdirección de Arqueología, Museo Nacional de Antropología, Reforma y Gandhi s/n
Mario Perez-Campa: Proyecto Cuicuilco, Instituto Nacionál de Antropología e Historia
Kim B. Knight: University of California

Nature, 2005, vol. 438, issue 7068, E7-E8

Abstract: Step change A report of human footprints preserved in 40,000-year-old volcanic ash in Mexico is challenged in an online Brief Communication Arising. Announced to the press in July this year, if true the discovery would overturn current theories on the timing of human migration to the Americas (believed to be some 30,000 years later). Argon dating and palaeomagnetic analysis show that the surface on which the prints were found is about 1.3 million years old, making it unlikely that these were human as they would then pre-date the appearance of Homo sapiens in Africa by over a million years.

Date: 2005
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DOI: 10.1038/nature04425

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