Figure 35C.  Lead concentrations in vibracore VC 98-3

Dates determined as in Figure 35B. Note rapid rise in lead concentration in post-World War II period, with peak at about 18 cm, and sharp decline to surface of sediment (present day). Analytical data obtained by total sediment dissolution method.

(modified from J. Flocks' figure, in Manheim and others, 1999)

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