Porvenir is one of several Late Archaic sites investigated by Jonathan Haas, Winifred Creamer and their team in the Pativilca and Fortaleza Valleys in the Norte Chico Region of north-central coastal Peru (Haas et al. 2013). This site had evidence of maize pollen recovered from soil samples, one of which had an associated radiocarbon date.

ID Other ID Type Subtype Uncal BP (years) ± 1 σ (years) Median cal BP (years) Lower cal BP (years) Upper cal BP (years) δ13C Contaminated?
Beta-199060 MicroSample pollen 4250 40 4732 4855 4584 No

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References Cited

Haas, Jonathan, Winifred Creamer, Luis Huamán Mesía, David Goldstein, Karl Reinhard and Cindy Vergel Rodríguez
    2013    Evidence for Maize (Zea mays) in the Late Archaic (3000-1800 B.C.) in the Norte Chico Region of Peru. PNAS Early Edition:1-5.