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Fragments of ferruginous brecciated limestones were studied in Bashkirian geological cross-sections in central part of Volga-Ural sedimentary basin. It is established that ferruginization of carbonate rocks is not controlled by facies. Mudstones, stromatolite boundstones and foraminiferal packstones have traces of diagenetic ferruginization. All carbonates are characterized by leaching traces in the form of sub vertical and inclined fractures and big pores filled by fine-grained calcite. Clasts of ferruginization ...