Fig. 3. Vertical variations in trace element concentration (As, Cr, Cu, Hg, Pb, Zn, and Al) and sediment texture (sand, silt, 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.