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; Geoffrey C. Clayton

doi:10.2475/06.2022.02

Research ArticleArticle

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

Brooks B. Ellwood

*Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803

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For correspondence: ellwood@lsu.edu

Sophie Warny

*Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803

**Museum of Natural Science, Louisiana State University, Baton Rouge, Louisiana 70808

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Rebecca A. Hackworth

***Chevron Energy Technology Company, 1500 Louisiana Street, Houston, Texas 77002

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Suzanne H. Ellwood

§PBI Specialists, Baton Rouge, Louisiana 70808

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Jonathan H. Tomkin

§§School of Earth, Society, and Environment, University of Illinois, 428 Natural History Building, 1301 W. Green Street, Urbana, Illinois 61801

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Samuel J. Bentley

*Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803

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Dewitt H. Braud

§§§Coastal Studies Institute, Louisiana State University, Baton Rouge, Louisiana 70803

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Geoffrey C. Clayton

‡Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70808

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American Journal of Science

Vol. 322, Issue 6

1 Jun 2022

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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, Geoffrey C. Clayton

American Journal of Science Jun 2022, 322 (6) 795-827; DOI: 10.2475/06.2022.02

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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, Geoffrey C. Clayton

American Journal of Science Jun 2022, 322 (6) 795-827; DOI: 10.2475/06.2022.02

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Keywords

Indigenous people
ancient mounds
radiocarbon dated ash beds
reed and cane plants
phytoliths
occluded carbon

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