“…While most such research has focused on the arid Puna highlands, where organic preservation is exceptionally good, more recently stable isotope analyses have started to be applied in the valleys laying at intermediate altitudes—1000–3500 masl—which connect the Puna to the lowlands (Dantas & Figueroa, 2018; Gheggi & Williams, 2013; Gordillo & Killian Galván, 2017; Izeta et al, 2009; Killian Galván et al, 2020, 2022; Ojeda, 2018; Oliszewski et al, 2020; Ratto et al, 2020; Srur et al, 2012). This area of valleys and sierras, though, is quite uneven and comprises great geological, geomorphological, altitudinal, and ecological variation (e.g., Killian Galván et al, 2022; Oyarzabal et al, 2018).…”