Active and relict contact karst morphological forms of the slavina corrosional plain

Astrid Svara, Andrej Mihevc & Nadja Zupan Hajna: Active and relict contact karst morphological forms of the Slavina corrosional plain The Slavinski ravnik corrosional plain is a small area of Dinaric karst in Slovenia, located at the contact between impermeable flysch and karstified carbonate rocks, where the most represen-tative ponor contact karst features have formed. Due to erosion, multiphase regional tectonic uplift, and sedimentation, a para -genetic cave system, active and relict blind valleys can be ob-served, reflecting the different stages of the morphogenesis of this area. To obtain a better overview and detailed understand-ing of the past and present behaviour of a dynamic karst sys-tem, in which hydrology is closely related to the spatial distri-bution and the extent of contact karst (allogenic) morphologi-cal features, geomorphological and sedimentological mapping was conducted. Maps were digitized using ESRI ArcMap and Golden Software Surfer based on DEM and LiDAR imagery. During the survey, the active cave system Markov spodmol and Vodna jama v Lozi, the relict unroofed cave Brezstropa jama v Lozi, Biscevci blind valley, Sajevsko polje blind valley, Ivacevci blind valley, and Sajevsko polje sediment accumulation were studied, and active and relict karst features were determined. It is concluded that their location, interrelation, sedimentological record, and overall occurrence show different stages of devel-opment of these geomorphic features with their hydrological function, indicating different stages of formation of the north-ern margin of the Slavinski ravnik at least within the last 4 mil -lion years. In summary, this is a unique, comprehensive study site where we can observe exposed and preserved elements, that reveal a gradual development of a ponor-contact karst area, which in most cases is not well preserved due to erosion and karst denudation processes.