GEOL. CROAT. 49/2 345 - 346 1 Fig. ZAG REB 1996 AhsIUIC/ - Note Structure of the Adriatic - Dinaric Platform Along the Secovlje - Postojna Profile Marijan POL.JAK and Igor RIZNAR The Adrialie - Dinaric pial form (GUSIC & JELAS­ KA , 1993) re fers to a ca rbonate platform of the EX ICf­ Ili.d Dinarides o f Mesozoic (U pper Triassic to Cre ta­ ceous) and Palaeogene (Palaeocene to Lower Eocene) age. In its northwestern part , several palaeogeograph ic units can be d istingui shed. The first one occupies the nort he rn part o f (s tria lip to the Skofije-Dekani -Kubc t area . Here, a hiatus occurred in sedimentat ion from the Upper Cenomanian 10 Ihe Pa laeocene (YELiC & YLA­ HOVle, 1994) . The area to the northeast, (hal belongs 10 the Slovene Kras, is characterized by an clll crs ion duri ng Uppe r Cam panian lime (JURKOVSEK cl aI. , 1996). In the area northeast from Postojna , the emer­ s ian is lim itcdto the Upper Maastri ch tian (S RI BAR , 1996). TcclOni ca lly , the Adriatic-Dinaric ca rbonate plat­ form exh ibits different degrees of struc tural de forma­ tion. The least de form ed part is the all-shore and on­ shore ISlrian pial form (D URASEK e l aI., 198 1) wil h a domi nant radial type of deformation. To the northeast the terrain of Kras, in addition to the Vipava va lley and • LJU6u.o."~ ri g. 1 Gcoiogicll i cross-sec ti on Sccovljc-PoslOjlla. Geo]ogic,d Survey, Oimiccva 14, 1000 Ljubljana, Slovenijil. I3rkini , is characterized by gentle fo lds ancl longituciinal normal to reverse fault s. The most cleformed pan is the High Karst Zone that lies northeast from Postojna. There could be a supposed re lationsh ip between the palaeogeographic and st ruc tu ra l units . DilTere nces in C rc taccous sed iment at ion may have been caused by synsedimenta ry norm al fa ulting a long reg ional faulls. These fau lts became reverse lis tric ones during Eocene regional compression. The main tec tonic displaeemcnt probably took place along the base or carbonate rocks a t the depths or 6000-7000 m. At the surface the displace­ ment is absorbed mainly by foldin g, whi ch is most intensive in the contact zones between the afo remen­ tioned palaeogeographic units. Th e mosl promincnt deformed zo ne is the south ­ western slope of Cicarija. It has been gcncrall y inte r­ pre ted as a thru sted and imbrica ted struc t ure (PLE­ N ICA R e l al. . 1969; SIKH': e l aI. , 1972). Il oweve r, de lajieci investigat ions have shown that Ih is area is built lip predominantl y o f va rious types of fo lds Ihal are onl y slight ly displaced along reverse faults (Fig. I). E Fly~dI (I:o