The Magura Nappe in the Polish sector of the Outer Carpathians consists of four tectonic subunits characterized by differing development of facies. From the south to the north, they include the Siary, Raèa, Bystrica and Krynica subunits. The sedimentary succession in the Raèa Subunit in the vicinity of the village of Osielec is composed of Campanian-Palaeogene flysch deposited in the Magura Basin. In this succession, the Middle Eocene Pasierbiec Sandstone Fm consists of thick-bedded sandstones and conglomerates with occasional intercalations of thin-bedded shale-sandstone flysch. Within the Pasierbiec Sandstone Fm at Osielec there is an olistostrome, rich in pebbles and cobbles of exotic rocks. In addition, large blocks of Neoproterozoic metabasites and boulders of Palaeogene organogenic limestones were found. The discovery of metabasites raised the possibility that the rocks in question could be evidence of supposed oceanic crust in the basement of the Magura sedimentary basin, because of the suggestion that they represent the Alpine orogenic cycle. This concept was abandoned when investigations of the absolute age of the metabasites gave a date of ca. 600 Ma. In the Osielec area, there are two tectonic thrust sheets in the Raèa Subunit, namely the Osielczyk Thrust Sheet in the north and the Bystra Thrust Sheet in the south; they are folded and cut by a transverse system of strike-slip and oblique faults. The Osielczyk Thrust Sheet was overthrust northwards on to the Siary Subunit.
The studied area, located in the south-western part of the Gorce Mountains, is built of flysch deposits representing the Krynica and Bystrica Subunits of the Magura Nappe. Here, in the Late Cretaceous-Early Miocene part of the lithostratigraphic succession of the Krynica Subunit, four formations containing several members were distinguished, whereas in the Bystrica Subunit, only one Middle Eocene-Oligocene formation was identified. The Turbacz and Kudłoń Thrust Sheets in the tectonic structure of the Krynica Subunit and the southernmost fragment of the Tobołów Thrust Sheet in the Bystrica Subunit are prominent. Several folds occur in the studied area. Numerous transverse and oblique faults are also present. The result of the present geological investigations in the study area was the creation of a geological map of the Magura Nappe deposits in the Gorce Mountains. In general, a high-resolution digital elevation model contributed significantly to the progress of this geological research.
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