The Cerutti Mastodon site is a paleontological and possible archeological site located in San Diego County, California. In 2017, researchers announced that broken mastodon bones at the site had been dated to around 130,700 years ago.

The bones were found with cobblestones displaying use-wear and impact marks among the otherwise fine-grain sands. Researchers have proposed that these marks were caused by the intentional breakage of the broken bones by hominins using the cobblestones. If so, this suggestion would be older by far than the scientific consensus for habitation of the New World, which generally traces widespread human migration to the Americas to 19,000 to 26,000 years ago.