Report on annually laminated sediment in lake Järlasjön, Nacka, Stockholm

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Abstract
Annual laminations — varves — in sediment cores from Järlasjön are described on the basis of microscopic examination and X-radiographic analysis. Dates are inferred from varve-counting and Cs-137 analysis. Four clay layers, which can be related to building-excavations in the surroundings of the lake, are exactly dated. Chemical changes in the recent sediment and in the sediment deposited around the isolation of the lake are discussed.