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We present the results of analysing stable carbon and nitrogen isotopes in camelid remains found at the Late Archaic site TU‐52 (ca. 5000–3800 bp), the Tarajne Phase site TU‐94 and the Early Formative sites TU‐54, TU‐85 and TU‐122 (ca. 3100–2400 bp). All of the sites are located in the Puna de Atacama (Northern Chile) along the 14 km Tulan transect, between the head of Tulan ravine (ca. 3000 m.a.s...