Abstract
Geological and archaeological investigation of the mode of origin of the marshes in Nordfriesland (Germany)In the bogs between marine sediments and Pleistocene uplands on the mainland of Nordfriesland, saltbearing peat for salt production was dug before, as well as while, the bogs were covered by sediments with high clay content. Additionally, there is not much fresh‐water coming from the Pleistocene uplands and carbonate is only preserved in the “Klei” deposited in the resulting holes. These facts show, that the “Klei” was originally calcareous and that it was deposited in water with a high salt content. Therefore one cannot conclude that adsorbed cations and narrow Ca:Mgratio (0.5–1.5) indicate sedimentation in brackish water and deposition of sediments with a low, or indeed, no carbonate content. Hence adsorbed cations and the Ca:Mgratio do not allow the separation of marsh soils from soils of a marine or brackish origin.
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