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Fig. 6. Vertical variations in normalized trace element concentration (As, Cr, Cu, Hg, Pb, and Zn; all are [mg/kg]/[clay %] except for Hg, which is [µg/kg]/[clay %]; from left to right) with depth below the lake bottom for Cores 12, 16, 34, and 35. Also shown is the interpreted 1954 timeline. Note variable units. Refer to Fig. 1 for core locations.
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