The investigated peat-bog of area 130 ha is located at the San river near Dubiecko, west of Przemyśl. Its altitude reaches 230 m a.s.l. The aim of the work is to complement of earlier documentation investigation of the peat-bog Bachórzec-Winne and stratigraphic estimation of peat deposit. The characteristic longitudinal section A–B was traced on the investigated peat deposit and 8 drillings were carried out using auger of the Instorf type. Determinations of the types, kinds and species of the analysed peat deposit was done using Tołpa et al. [1976] classification. Regarding typology, the examined peat-bog has differentiated character, because it was stated that both raised and lowland bog occurs. Decidedly prevails lowland bog and kind Magnocaricioni, species Cariceto Phragmiteti. Stratigraphic structure shows that runoff of water from the peat-bog had been dammed, what caused water lifting, inundation of the peat-bog and finally initiated creation of raised bog layer, underlain by lowland bog type.

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