Monte Verde Dating Dispute Reignites — SkimNews
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- Todd Surovell of the University of Wyoming and colleagues published a paper in Science in March 2026 arguing that Monte Verde II dates to between 8,200 and 4,200 years ago, based on the ~11,000-year-old Lepué Tephra ash layer from the Michinmahuida volcano that Surovell's team says must overlie the site.
- Tom Dillehay of Vanderbilt University, who has excavated Monte Verde since 1977 and originally dated Monte Verde II to ~14,500 years ago using a peat layer overlying the artifacts, published a full rebuttal in PaleoAmerica on August 19 disputing Surovell's stratigraphy.
- A central point of the dispute: Surovell's team excavated along the Chinchihuapi creek flood plain but never at Monte Verde itself, with Dillehay noting the team 'never saw the stratigraphy and examined only surface landscape from 50 to 4,000 meters away.'
- Surovell argues the abundance of Ice Age–dated wood at the site was eroded from older deposits and washed into younger surfaces, while Dillehay counters that the wood shows no flood-damage signs and was not redeposited.
- Monte Verde II became the first pre-Clovis site to survive scientific scrutiny, overturning the Clovis First model that had placed the earliest Americans at ~13,000 years ago; independent pre-Clovis evidence now includes footprints and drag marks at White Sands National Park in New Mexico.
Why it matters: If Surovell's redating holds, Monte Verde would drop from the oldest undisputed human site in the Americas to a mid-Holocene occupation — forcing a rewrite of textbooks that already credited the site with breaking the Clovis First consensus and pushing the peopling of the Americas thousands of years earlier. The episode illustrates 'experimenter's regress': both teams accuse the other of flawed stratigraphy on a flood plain where rivers shift and sediments mix, making resolution dependent on the very evidence under dispute.
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