Did humans reach North America 130,000 years ago, long before we previously thought?
In short: A discovery in southern California suggests an unidentified species of Homo was butchering mastodons in North America over 100,000 years earlier than current consensus allows. By analyzing fractured bones and heavy hammerstones, researchers argue this site rewrites the timeline of human arrival in the Americas, though the claim remains highly controversial.
The Cerutti Mastodon site, discovered during a 1992-1993 freeway expansion in San Diego County, contains the remains of a single juvenile Mammut americanum. Excavated from a sandy silt stratum, the site yielded over 300 bone fragments alongside five large cobbles. Researchers identified these stones as hammerstones and anvils, noting they display impact marks and use-wear patterns consistent with the intentional processing of fresh bone. Because these stones are hydraulically anomalous in the fine-grained sediment, the team argues they were brought to the site by hominins.
Using 230Th/U radiometric analysis and diffusion–adsorption–decay models, the team dated the site to 130.7 ± 9.4 thousand years ago. This period aligns with the last interglacial, known as MIS 5e. The researchers contend that the spiral fractures on the mastodon limb bones indicate they were broken while still fresh, likely to extract marrow or to obtain raw material for tool production. This systematic reduction of proboscidean bones mirrors Palaeolithic technologies observed in Africa and Eurasia, suggesting that humans with significant manual dexterity and technical experience were present in the region.
The findings have sparked intense debate, as they challenge the prevailing view that human migration to the Americas occurred between 19,000 and 26,000 years ago. Critics remain skeptical, pointing to the absence of human skeletal remains and the lack of traditional lithic debris or unequivocal stone tools. Some argue the bone breakage could result from natural geological processes rather than human intervention. Despite the scrutiny, proponents maintain that the spatial association of the bones and the specific percussion marks on the cobbles provide compelling evidence for an extremely early, previously unrecognized human presence in the New World.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: A 130,000-year-old archaeological site in southern California, USA - Nature
- Also: A 130,000-year-old archaeological site in southern California, USA
- Also: Cerutti Mastodon site
To cite this card, link to https://intellectplus.co.uk/app/culture-cerutti-mastodon-site.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in US culture · More in Cultures · Latest · A–Z · All topics
