Ancient American Settlement’s Age Under Scrutiny: New Study Challenges Monte Verde Timeline
For decades, the archaeological site of Monte Verde in Chile has been a cornerstone of our understanding of the earliest human presence in the Americas. Scientists have long pointed to evidence, including ancient footprints, crafted wooden tools, the foundations of a dwelling, and the remnants of a hearth, suggesting human activity dating back an astonishing 14,500 years. The consistent dating of sediments and artefacts from the site has solidified this timeline in the scientific community.
However, a recent study is stirring the pot, proposing that Monte Verde might be significantly younger than previously believed. This re-evaluation, based on new geological analysis, has sparked debate, with some experts questioning the findings and others defending them.
A New Look at the Geology
The core of the new research lies in a detailed examination of the geological layers surrounding Monte Verde. Scientists involved in the study collected and dated sediment samples from nine locations along the Chinchihuapi Creek, adjacent to the archaeological site. Their aim was to reconstruct the landscape’s evolution over millennia.
During this process, they identified a distinct layer of volcanic ash. Radiocarbon dating of this ash layer placed its origin at approximately 11,000 years ago. According to Claudio Latorre, a co-author of the study and a researcher at the Pontifical Catholic University of Chile, this volcanic event has profound implications for the age of the artefacts found at Monte Verde.
“We basically reinterpreted the geology of the site,” Latorre explained. “And we came to the conclusion that the Monte Verde site cannot be older than 8,200 years before present.”
The researchers posit that changes to the landscape over time, including the erosive action of the creek, may have led to the mixing of older and newer geological layers. This geological disturbance, they suggest, could be the reason why ancient wooden artefacts were inadvertently dated as part of the Monte Verde site, leading to an overestimation of its age.
The study’s findings were published in the prestigious journal Science. However, the conclusions have not been met with universal acceptance. Several scientists, including those who were instrumental in the original excavations of Monte Verde, have voiced strong disagreements.
Expert Pushback and Alternative Interpretations
Michael Waters of Texas A&M University, who was not involved in the new research, expressed skepticism. “They have provided, at best, a working hypothesis that is not supported by the data they presented,” Waters stated.
Other experts not affiliated with the study have raised concerns about the methodology and the scope of the new research. A key criticism is that the new study analysed samples from the broader area surrounding Monte Verde, arguing that the geology in these peripheral zones may not be directly comparable to the specific archaeological context of the site itself.
Furthermore, critics contend that the evidence for the volcanic ash layer having once covered the entire Monte Verde landscape is insufficient. They also point out that the new study fails to adequately explain the presence of artefacts directly dated to 14,500 years ago, such as a mastodon tusk modified into a tool, a wooden lance, and a digging stick with a charred tip.
Archaeologist Tom Dillehay of Vanderbilt University, who led the initial excavation of Monte Verde, expressed his reservations via email: “This interpretation disregards a vast body of well-dated cultural evidence.”
Defending the Findings and Future Implications
The authors of the new study maintain their position, refuting these criticisms. They assert that their sampling strategy included locations both within and along the Chinchihuapi Creek, upstream and downstream from the site. Todd Surovell from the University of Wyoming, another co-author, further argued that there isn’t conclusive evidence to support the extreme age of the dated artefacts found at the site.
The Monte Verde site holds immense importance for understanding how humans first populated the Americas. Previously, the prevailing theory suggested that the earliest inhabitants were the Clovis people, who arrived around 13,000 years ago and were known for their distinctive tipped stone tools. The discovery and initial dating of Monte Verde appeared to challenge this long-held belief.
The potential for a revised date for Monte Verde raises significant questions about the broader narrative of human migration into the Americas. While sites in North America, such as Cooper’s Ferry in Idaho and the Debra L. Friedkin site in Texas, have since been discovered that predate the Clovis culture, the exact timing and routes of these early migrations remain a subject of intense scientific inquiry.
A key unanswered question revolves around how early humans traversed the vast distances from Asia to the Americas, navigating south of the colossal ice sheets that once covered Canada. Did they arrive during a period when these ice sheets had receded, creating an ice-free corridor? Or did they travel along the Pacific coast by boat, or perhaps a combination of coastal and land routes?
According to Surovell, a revised timeline for Monte Verde could reignite discussions about the most probable migratory pathways taken by early humans. He believes that future independent analyses of other early human settlements will be crucial in shedding more light on these complex questions.
“Given enough time and given the ability to do science, science is self-corrective,” Surovell concluded. “It eventually reaches the truth.”
