Location of the studied area. A, palaeogeographical situation of the Styrian Basin within the early–mid-Miocene Paratethys Sea (modified after Rögl 1998). B, simplified geological map and position of Činžat in north-eastern Slovenia. 1, early Miocene conglomerates; 2, early Miocene fossiliferous siltstones; 3, plutonic rocks of the Pohorje massif; 4, metamorphic rocks of the Kozjak series.