The research area includes the wider area of the fork of the Vrapčak stream and the Mikulić stream, north of the settlement of Gornje Vrapče. In the observed area, rocks of the Paleozoic, Upper Triassic, Upper Cretaceous and Miocene appear. Paleozoic rocks are represented by metamorphites, presumed to be Devonian-Carboniferous. They build the northern and eastern part of the investigated area, and parametamorphites and orthometamorphites are distinguished. The ratios of metamorphites are the same as in the wider area of Medvednica, ie parametamorphites surround the main mass of orthometamorphites. Upper Triassic deposits, located in the southwestern part of the study area, are represented by early diagenetic dolomites. Upper Cretaceous deposits are emitted in the central part of the study area. Within them, four facies have been identified: base conglomerates, pelagic "scaglia limestones", a flysch series of the youngest Cretaceous (Gozavske deposits) and turbidite sediments. The southern part of the investigated terrain is marked by Miocene deposits. Within them, the Baden deposits are represented by basic dolomite breccias on which lithotamnian limestones rest, followed by spongit calxillites and Baden sandstones. The transition to sarmat is marked by the beginning of the deposition of brackish deposits, ie obliquely layered biocalcarenites on which the transitional obliquely laminated oncoid VI limestones rest. The youngest deposits of the investigated area are Lower Pannonian flat layered clay limestones better known as "croatica deposits".