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We use the peak trace of Cs-137 to determine the stratigraphic interval that was deposited in 1954.
Least squares regression is used to determine the slope of the decay curve, from which the sedimentation rate can be calculated.
Uranium-233 is produced by the neutron irradiation of thorium-232.
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The available lamina data support the sedimentation rate estimates made from radiometric measurements.
An increase was found in trace-metal concentrations (Zn: 90-807 ppm ; Cu: 30-176 ppm and Pb: 40-225 ppm) and mass accumulation rates (MAR; Zn: 0.003-0.10 g m 2 yr -1 , Cu: 0.001-0.02 g m 2 yr -1 and Pb: 0.002-0.02 g m 2 yr -1 ) across the upper 5 cm of the sediments.