Figure 3: Illimani Cu EFs compared to Cu records from other natural archives in South America.
From: Ice-core evidence of earliest extensive copper metallurgy in the Andes 2700 years ago
Illimani Cu EF record (green, 50-year medians) together with Quelccaya ice core Cu EFs16 (grey, 50-yr medians), sediment core anthropogenic Cu from Laguna Pirhuacocha17 (blue, non-equidistant data), and peat bog Cu/La ratios from Tierra del Fuego15 (brown, non-equidistant data). Periods of generalized Andean archaeological history together with dominating cultures are indicated by green shaded areas.
