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Here we focused on the massive, non-pedogenic, loess-like siltstones, which are common within the fluvio-lacustrine Middle Permian red sediments of Kazan Volga region, to refine their depositional settings. Sedimentological, mineralogical and geochemical methods including field description, grain size analysis, optical microscopy, bulk geochemistry and X-ray diffraction, were used. Siltstone facies from the Urzhumian red beds of this region are represented by two types: laminated and massive, the last one is commo...