| a 130,000-year-old archaeological site in southern california, usa. | the earliest dispersal of humans into north america is a contentious subject, and proposed early sites are required to meet the following criteria for acceptance: (1) archaeological evidence is found in a clearly defined and undisturbed geologic context; (2) age is determined by reliable radiometric dating; (3) multiple lines of evidence from interdisciplinary studies provide consistent results; and (4) unquestionable artefacts are found in primary context. here we describe the cerutti mastodon ... | 2017 | 28447646 |