Chocolate clays of the Northern Caspian Sea Region: Distribution, structure, and origin
作者： R.R. Makshaev , A.A. Svitoch
DOI: 10.1016/J.QUAINT.2015.07.018
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摘要: Abstract The chocolate clays commonly comprise a part of the Lower Khvalynian sequence in northern Caspian Lowland and Volga region. mode occurrence varies from continuous to patchy mosaic. All clay deposits are confined Pre-Khvalynian depressions various origins. There several sub-facies distinguishable within facies: mono-clayey (typologic), stratified sandy-clayey silty-clayey. Judging specific features lithology, geomorphic position, occurrence, mollusc fauna composition, radiocarbon dates, represent facies sediments cannot be considered as an individual stratigraphic unit.
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