The explored area is about 4 km east of Slunj town at the region known as Kordun Karst. This location stipulated the specific condition for the formation of the speleological objects in the south area of Grabovac Valley. The Grabovac Stream flows from the north to the south through the Grabovac Valley connected to the canyon of the river Korana. Partially the Grabovac Stream flows underground. In this area in the period of years 2000 and 2001 a member of Speleological society Karlovac (Karlovac, Croatia) explored three caves. The biggest is Ponor pod Kremenom Cave with total length of the channels of 1019 m. The underground part of the Grabovac Stream flows through its channels. In the south of the dry part of the valley there are two caves: Gornja Barićeva (260 m long) and Donja Barićeva (26 m long). Morphological characteristics indicate the dynamics of the formation of the cave system under the influence of the allogenic water. They are the result of the corrosion and erosion caused by the water of the underground part of Grabovac Stream during several phases. These tree caves are parts of one system in sense of speleogenesis. Six basic phases of the formation of the speleological objects can be established. The aim of this paper is to give the basic theses about the morphogenesis of these caves, particularly in relation to their geomorphological position.Istraživano područje nalazi se oko 4 km istočno od grada Slunja, u okviru tzv. kordunskog krša. Potok Grabovac teče od sjevera k jugu dolinom koja se spaja na kanjon rijeke Korane. Potok Grabovac je ponornica, tj. djelomično teče podzemno. Ovdje su u razdoblju od 2000. do 2001. članovi Speleološkog društva Karlovac istražili tri špilje. Najveća je Ponor pod Kremenom, dužine 1019 m. Kroz nju prolazi podzemni dio potoka Grabovac. Na jugu suhog dijela doline su još dvije špilje: Gornja Barićeva (dužine 260 m) i Donja Barićeva (dužine 26 m). Morfološke karakteristike ovih špilja upućuju na dinamiku razvoja ovoga špiljskog sustava pod utjecajem alogenoga vodenog toka. Ove tri špilje nastale su kao rezultat korozijskog i erozijskog djelovanja podzemnog dijela potoka Grabovac kroz nekoliko faza. One su dijelovi jedinstvenog sustava u speleogenetskom smislu. Može se razlikovati šest osnovnih faza u nastanku toga špiljskog sustava. Naglasak je ovog rada na morfogenezi ovih špilja, posebno u odnosu na njihov geomorfološki položaj
