A 2024 study argues that marks on an extinct giant armadillo relative’s bones were made by humans about 21,000 years ago. The fossil, found in Argentina, may be early evidence of people interacting with megafauna in southern South America—but it does not by itself establish when humans first arrived anywhere in the Americas.
What did researchers find?
The specimen, identified as CRS-10, belongs to Neosclerocalyptus, an extinct glyptodont related to modern armadillos. It was recovered from the banks of the Reconquista River near Merlo, in Buenos Aires Province, Argentina. Preserved remains include pelvic material, caudal vertebrae and rings, a tail tube, and part of the animal’s armored carapace. Details of the find and analysis are reported by Del Papa and colleagues in PLOS ONE (2024).
The researchers examined marks on bones and osteoderms—the bony plates in the animal’s armor. They assessed the marks’ shapes, locations, and patterns, along with the archaeological context and possible non-human explanations. They concluded that the patterned marks and associated butchering patterns were anthropic, meaning caused by human activity. The study’s account of the specimen and its modifications is the basis for that interpretation.
How old is the specimen?
Del Papa and colleagues report a direct AMS radiocarbon date on CRS-10 of 17,397 ± 52 radiocarbon years before present (BP). After calibration, the result is 21,090–20,811 calendar years BP at 95.4% probability (two sigma). Radiocarbon years and calibrated calendar years are different measures; the calibrated range is the appropriate figure when describing the specimen’s calendar age. The paper also discusses a date from bivalves in an underlying deposit and uses the surrounding stratigraphy as a contextual check.
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What does the evidence say about people?
The authors interpret the cut marks as evidence that people processed or butchered the glyptodont. This is a behavioral association inferred from modifications to the animal’s remains, not a discovery of human tools beside the fossil: the study reports no physical association between CRS-10 and artifacts at the site.
That distinction matters when weighing early-presence claims. A fossil with marks interpreted as human-made can indicate interaction, while tools physically found with animal remains would provide a different kind of association. The study considers the marks’ morphology, distribution, context, and possible alternative agents; readers should understand its conclusion as the authors’ interpretation of that evidence, rather than as a directly co-located assemblage of people, tools, and animal remains.
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Does this prove people were the first in the Americas?
No. The paper presents CRS-10 as evidence relevant to early human presence and human-megafauna interaction in southern South America, especially the Pampean region. It does not establish a continent-wide first-arrival date, nor does one specimen settle the broader debate over when people reached the Americas.
For comparison, the authors place the find against other southern South American sites whose chronologies, as discussed in their paper, span roughly 8,000–15,000 calibrated years BP. That is the paper’s comparison, not a complete inventory of every proposed early site. The authors describe their contribution cautiously: “Our results provide new elements for discussing the earliest peopling of southern South America and specifically for the interaction between humans and local megafauna in the Pampean region during the Last Glacial Maximum.”
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How should this find be evaluated?
Claims about early human activity are strongest when several independent lines of evidence align. For a find like CRS-10, useful questions include:
- Association: Are tools physically present with the remains, or is human involvement inferred from marks on the bones?
- Dating: Was the specimen itself dated directly, or is its age inferred from surrounding material?
- Stratigraphy: Is the specimen’s position in the deposit intact and consistent with the dating evidence?
- Modification: Do the marks’ shape and pattern fit human cutting, and how thoroughly are other possible causes considered?
Here, the specimen has a direct radiocarbon date, while the human connection rests on the researchers’ interpretation of patterned bone modifications and their context. The lack of tools physically associated with the fossil is a relevant limit, not a reason to describe the date or the authors’ interpretation as something they did not claim.
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