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The separate layer of rhizoid limestone from Urzhumian red succession of Tetyushi Volga region was studied to clarify its depositional features. Field description, optical microscopy, bulk geochemistry, stable isotopes of carbon and oxygen analysis, scanning electron microscopy (SEM) were used. The limestone under study has a thickness of about 1 m, is penetrated by a network of thin root channels (rhizoid limestone), the upper part of the rhizoid limestone is overlain by thin-laminated leafy limestone (3-5 cm) (l...