Cerutti Mastodon Site

The Cerutti Mastodon site is a palaeontological site in eastern Chula Vista where, in 1992, construction work on a freeway extension exposed the partial skeleton of a mastodon alongside what appeared to be fractured bones and hammerstones. The site is named after the San Diego Natural History Museum (SDNHM) palaeontologist who excavated it.

The significance of the site lies in its contested age. A 2017 study published in Nature used uranium-series dating to date the bones to approximately 130,000 years ago and argued that the fracture patterns on the bones and rocks were consistent with human activity. If accurate, this would push back the presence of hominins in the Americas by more than 100,000 years. The site itself is not accessible to visitors, but the SDNHM in Balboa Park holds the recovered materials and has permanent exhibits addressing the controversy. The debate over this site touches fundamental questions about human prehistory.

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A story
In 1992, SDNHM palaeontologist Richard Cerutti excavated a mastodon skeleton from a construction site in Chula Vista and found that the bones had been broken and arranged alongside hammerstones in a way that suggested human activity. The site became controversial after a 2017 study dated the bones to 130,000 years ago — approximately ten times older than the accepted timeline for human arrival in the Americas. The finding remains contested but has not been conclusively refuted.