Scientists Question Age of Key Site in Human Migration to Americas

Researchers are disputing the timeline of Monte Verde, a Chilean archaeological site that has been central to understanding early human settlement in the Americas. A new study suggests the site may be thousands of years younger than previously believed, though other experts strongly disagree with these findings.

A Chilean archaeological site that has served as cornerstone evidence for early human migration to the Americas is facing new scrutiny from researchers who believe it may be thousands of years younger than originally determined.

Monte Verde has long been considered the most compelling proof of human presence in the Americas dating back approximately 14,500 years. Archaeological teams discovered evidence including human footprints, wooden implements, structural foundations, and remnants of ancient hearths at the location, with sediment and artifact analysis supporting this timeframe.

However, fresh research published Thursday in Science journal questions these age estimates, proposing that Monte Verde could be significantly more recent than previously established. The controversial findings have sparked heated debate among archaeological experts.

Researchers examined sediment samples from nine locations along Chinchihuapi Creek near the site, studying how the terrain evolved across millennia. Their investigation revealed volcanic ash deposits from an eruption that occurred roughly 11,000 years ago.

Study co-author Claudio Latorre from Pontifical Catholic University of Chile explained that materials found above this ash layer, including Monte Verde’s wooden artifacts, must be more recent in origin.

“We basically reinterpreted the geology of the site. And we came to the conclusion that the Monte Verde site cannot be older than 8,200 years before present,” Latorre stated.

The research team believes geological processes, including stream erosion of rock formations, may have caused mixing of older and newer sediment layers, leading previous investigators to incorrectly date ancient wood as belonging to the Monte Verde settlement.

Multiple scientists, including those who participated in the original excavations, are challenging these conclusions.

“They have provided, at best, a working hypothesis that is not supported by the data they presented,” commented Michael Waters from Texas A&M University, who was not involved in either research effort.

Critics argue the study analyzed samples from areas surrounding Monte Verde where geological conditions differ from the actual site. They also contend there is insufficient proof that volcanic ash deposits once blanketed the entire region.

Additionally, skeptics point out the research fails to adequately address artifacts directly dated to 14,500 years ago, including a mastodon tusk converted into a tool, a wooden spear, and a digging implement with a charred end.

“This interpretation disregards a vast body of well-dated cultural evidence,” archaeologist Tom Dillehay of Vanderbilt University, who directed the site’s initial excavation, wrote in an email response.

The new study’s authors reject these criticisms, maintaining they collected samples from within the site as well as upstream and downstream locations. Co-author Todd Surovell from the University of Wyoming argues there is inadequate evidence confirming the dated artifacts are genuinely that ancient.

Monte Verde plays a crucial role in scientific theories about human arrival in the Americas. Researchers previously believed the first inhabitants were groups arriving 13,000 years ago who created distinctive stone implements called Clovis points. Monte Verde’s discovery and dating, though initially controversial, seemed to settle this debate.

The impact of a revised timeline for the site remains uncertain. Since Monte Verde’s recognition, archaeologists have identified North American locations predating Clovis peoples, including Cooper’s Ferry in Idaho and the Debra L. Friedkin site in Texas.

A major remaining question concerns how people traveled from Asia to the Americas, navigating around two enormous ice sheets covering Canada. Did humans arrive when the sheets separated, creating an ice-free passage? Did they journey along coastlines using boats, or traverse a combination of water and land routes?

Surovell suggested that updated dating for Monte Verde might restart discussions about the most probable paths taken by early humans. Additional independent studies of other ancient human sites could provide greater understanding.

“Given enough time and given the ability to do science, science is self-corrective,” Surovell observed. “It eventually reaches the truth.”