Figure 2: Ice core records of Cu, Pb, Sb, and Ce concentrations together with EFs, and lake levels of the Lake Titicaca for the period 4500 BC–2000 AD. | Scientific Reports

Figure 2: Ice core records of Cu, Pb, Sb, and Ce concentrations together with EFs, and lake levels of the Lake Titicaca for the period 4500 BC–2000 AD.

From: Ice-core evidence of earliest extensive copper metallurgy in the Andes 2700 years ago

Figure 2

Concentrations (bars) and EFs (black lines) are shown as 50-year medians. Pb data for the period 0–2000 AD are from ref. 21. Reconstructed lake levels of the Lake Titicaca are additionally presented in black23 and grey60 (inverse scale).

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