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Fig. 2. Radio-chronological data of the top 9.5 cm of Lake Clair sediments. (a) Variation of ¹³⁷Cs activity vs. depth and (b) variation of unsupported ²¹⁰Pb activity vs. cumulative mass of sediments. Error bars are counting error (±SE). (c) Approximate year of sedimentation vs. depth. The year of sedimentation was derived from the ²¹⁰Pb constant flux–constant sedimentation (CFCS) model (Oldfield and Appleby, 1984; Robbins and Herche, 1993).