Abstract
Abstract On the basis of detailed examinations of a seacliff exposure near the settlement of Seyakha on the east coast of Yamal Peninsula the authors conclude that this considerable thickness of ice‐rich sediments, enclosing massive syngenetic ice wedges, accumulated under estuarine conditions, i.e., conditions of periodically inundated salt marshes, rather than under alluvial/floodplain conditions as has been most commonly suggested elsewhere for this type of complex. Their conclusions are supported by a detailed analysis of the stratigraphy, radiocarbon dates on organic matter, and a thorough analysis of the diatoms in the sediments and their salinities. The sediments are thought to have accumulated (and the ice wedges to have formed) between 30,000 and 16,000 years B.P.
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