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radiocarbon dated ash beds

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    The LSU campus mounds, with construction beginning at ∼11,000 BP, are the oldest known extant man-made structures in the Americas
    Brooks B. Ellwood, Sophie Warny, Rebecca A. Hackworth, Suzanne H. Ellwood, Jonathan H. Tomkin, Samuel J. Bentley, Dewitt H. Braud and Geoffrey C. Clayton
    American Journal of Science June 2022, 322 (6) 795-827; DOI: https://doi.org/10.2475/06.2022.02

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