Ancient American Settlement’s Age Questioned in New Study
For decades, the Monte Verde site in Chile has been hailed as the cornerstone of our understanding of the earliest human presence in the Americas. Scientists have unearthed a wealth of evidence here, suggesting human activity dating back approximately 14,500 years. This evidence includes remarkably preserved ancient footprints, sophisticated wooden tools, the foundations of a dwelling, and the remnants of a hearth. The consistent dating of sediments and artefacts from the site has long supported this ancient timeline.
However, a recent scientific investigation is casting doubt on the established age of this pivotal archaeological location, proposing that Monte Verde might be significantly younger than previously believed. This new perspective, naturally, has sparked debate within the scientific community, with not all researchers agreeing with the revised conclusions.
The core of the new study involves a detailed re-examination of the geological layers surrounding Monte Verde, specifically along the Chinchihuapi Creek. Researchers meticulously sampled and dated sediments from nine distinct locations adjacent to the site. Their analysis focused on reconstructing the landscape’s evolution over millennia. During this process, they identified a distinct layer of volcanic ash. Crucially, this ash layer has been dated to approximately 11,000 years ago.
According to Claudio Latorre, a co-author of the new study and a researcher at the Pontifical Catholic University of Chile, the presence of this volcanic ash layer has profound implications. He argues that any material found above this ash layer, which includes the well-known wooden artefacts and other remnants attributed to the Monte Verde site, must logically be younger than the ash itself.
“We essentially reinterpreted the geology of the site,” Latorre explained. “And we arrived at the conclusion that the Monte Verde site cannot be older than 8,200 years before present.”
The researchers behind this new study suggest that geological processes, such as the natural erosion caused by the creek carving through the landscape, may have inadvertently mixed older geological strata with more recent ones. They theorise that this disturbance could have led earlier researchers to mistakenly date ancient wood and other organic materials as part of the Monte Verde settlement itself, thereby inflating its perceived age.
The findings of this new research were published recently in the prestigious journal Science. However, the study has encountered significant pushback from several scientists, including some who were directly involved in the original excavations at Monte Verde.
Michael Waters, a professor at Texas A&M University who was not involved in either the original or the new study, voiced his scepticism. “They have provided, at best, a working hypothesis that is not supported by the data they presented,” Waters stated.
Other experts, also unaffileated with the latest research, have raised concerns about the methodology. They point out that the new study analysed samples from the broader area surrounding Monte Verde, arguing that the geological conditions in these peripheral areas are not directly comparable to the specific context of the archaeological site itself. Furthermore, these critics contend that there is insufficient evidence to definitively conclude that the volcanic ash layer once uniformly covered the entire landscape, a key assumption for the new dating.
A significant point of contention is the new study’s perceived lack of a robust explanation for the array of artefacts discovered at Monte Verde that have been directly radiocarbon-dated to 14,500 years ago. These include items like a mastodon tusk expertly fashioned into a tool, a wooden lance, and a digging stick with a deliberately burned tip – all strong indicators of human craftsmanship at a much earlier period.
Archaeologist Tom Dillehay of Vanderbilt University, who led the initial excavations at Monte Verde, expressed strong disagreement in an email, stating, “This interpretation disregards a vast body of well-dated cultural evidence.”
The authors of the new study, however, stand by their findings. They assert that their sampling strategy included areas both within, upstream, and downstream of the site, aiming for a comprehensive geological picture. Co-author Todd Surovell from the University of Wyoming also suggested that the evidence for the direct dating of the artefacts to 14,500 years ago might not be as conclusive as previously assumed.
The Monte Verde site holds immense importance for scientists piecing together the complex puzzle of how humans first populated the Americas. Historically, the prevailing theory suggested that the earliest arrivals were the Clovis people, who arrived around 13,000 years ago and are characterised by their distinctive tipped stone tools. The discovery and initial dating of Monte Verde, despite facing early controversy, appeared to largely settle this debate by pushing back the timeline of human presence significantly.
The potential impact of a revised date for Monte Verde on our understanding of human migration history remains a significant question. Even with the established timeline, researchers have since uncovered other North American sites that predate the Clovis culture, such as Cooper’s Ferry in Idaho and the Debra L. Friedkin site in Texas.
A fundamental and ongoing debate centres on the precise routes early humans took to travel from Asia to the Americas, particularly navigating the formidable glacial ice sheets that once covered much of Canada. Did humans arrive during a period when these ice sheets had parted, creating an ice-free corridor? Or did they travel predominantly along the coastlines by boat, or perhaps a combination of both land and sea routes?
Surovell suggests that a revised dating for Monte Verde could indeed reignite discussions about the most plausible migration pathways for early peoples. He believes that future independent analyses of other early human sites will be crucial in providing greater clarity.
“Given enough time and given the ability to do science, science is self-corrective,” Surovell concluded. “It eventually reaches the truth.”
