GEOLOGICA BALCANJCA, 23 . 5, Sofia, Oct. 1993, p. 35-45. The Triassic tn Southwest Bulgaria. Upper Triassic red beds (Moesian Group) m the Golo-bardo unit Kiril Budurov, Ivan Zagorcev, Ekaterina Trifonova Geological Institute , Bulgarian Academy of Sciences, 1113 Sofia (Received 26. 04. 1993; accepted 29. 04. 1993) K. Syc)ypoa, If. 3acop'lee. E. Tpuifjonoaa - Tpua c 6 10co-3anac>uoit So .·tzapuu. Bepxuempuacoebze "pacHOifGI!m- llble OIII.'IO:>IC!!II/1.'1 ( MuJuikKO.'I <'PY/111{/) " ro.t06btp0cKoii eOuHUIJI! . BepxHeTpHaCOBble KpaCHOuBeTHbie OTJlOlKeHHll (MuJul!cKall rpynna) B rono6b!PllCKoli ellKHHI..le nonpaJneneHbi Ha TPH CBHTbi. CaMaS! HHll<Hllll, CnaaelicKall CBH- Ta JaneraeT Hall aepXHeTpuaCOBOH llOJlOMHTOBOH PyCHHOBlleJTCKOH CBHTOH H C.irolKeHa H3 neCTpouBeTHblX Mep- reneH, llO!lOMHTOB H OOJlHTOBbiX, lKe!lBaKOBblX HJlH 6HOlleTpHTOBb!X H3BeCTH!IKOB, 'faCTO COlleplKall.IHX OCTaTKH lj:lopaMHHHij:lep, OCTpaKOll, BOllOPOCJleH H KOllpo!lHTOB. cf>opaMKHHij:lepoBOe COOfill.leCTBO BKJliO'!aCT Angu/odis- CUS friedli , Nodosaria ordinata H Semiinvoluta clari H yKa3biBaeT Ha HOPHHCKHit BoJpacT. TiocnenYIOll.IHe, KoM- illTHUKa!l CBHTa (KpaCHOuBeTHble CJlaHI..lbl, anespO!lHTbl H nec'!aHHKH) H BeTpyWCKa!l CBHTa (uecTpOuBeTHble KOHTJlOMepaTbl, CJlOlKeHHb!e H3 Kap6oHaTHblX o6!10MKOB) paCOOJlOlKeHbl B cynepn03Hl(HH H !laTepaJibHO CO'!Jle- HeHb! . Pa3pe3 MH3HHCKOit rpynllbi nepeKpbraaeTCII c pa3Mb!BOM H He6onbmHM HecornacueM cpe.o:HeiOpcKo.ll TIO!laTeHCKOit CBHTOH. 06!10MKH BeTpyWCKOH CBHTbl IIpoHCXO.D:liT B OCHOBHOM H3 aepXHeTpHaCOBbTX PyCHHOB.D:enCKOlt H Tpb!H- CKOH CBHT H H3 aHH3HHCKO-Jla.O:HHCKOH Pa.D:OMHpcKOlt CBHTb!. 06J10MKH H3 PallOMHpcKOH CBHTbl CO.D:epJKaT KO- HOllOHTbl, yKa3biBa!Oll.IHe Ha KOHOllOHTHbre 30Hbi Pridae/la cornu/a R. Z., Pridaella excentrica R. Z. H Pridael- la bakalo1•i R. Z. CocTas o6nOMKOB a BeTpywcKoll CBHTe yKa3biBaeT Ha HX B03MOlKHblH HCTO'IHHK - Jli06aw- CKYIO ellH.HHI..lY (paCDOJlOlKeHHYIO K ceaepo-3ana.o:y OT rono6b!PllCKOH ellH.HHI..lbl), TaK KaK HH.lKHeTpHaCOBble H HHlKHeaHR3HHCKH.e CBHTb! B JTOH ellH.HHI..le HenocpellCTBeHHO IIOKPbiBaiOTCll HHlKHe- H cpe.o:He!OpCKH.MH CBHTaMH, H TaKHM o6pa30M CBMlleTe!lbCTBYIOT 0 rny60KOit n03.D:HeTpHaCOBOH 3p03HH H .D:eHyllal..lMH. 3TOT lj:laKT OllpOBep- raeT MHeHHe 0 TIOJlHOH aJl!lOXTOHHOCTH ron06biPACKOH ellHHHI..lb!. Abstract . The Upper Tri assic red beds (Moesian Group) in the Golo-bilrdo unit are subdivided into three formations . The basal Slavey Formation is situated over the Upper Triassic dolomitic Rusinovdel For- mation , and consists of variegated marls, dolomites, and oolithic, nodular or biodctritic limestones often con- taining foraminifers, ostracods, algae and coprolites. The foraminiferal assemblage includes Angulodiscus fried- li, Nodosaria ordinata and Semiinvoluta clari, and indicates a Norian age. The following Komstica Formation (red shales, siltstones and sandstones) and Vetruska Formation (variegated conglomerates built up of carbonatic pebbles) are situated in superposition and with l ateral interfingering. The section of the Moesian Group in the Golo-bilrdo unit is covered after wash-out and with a slight unconformity by the Mid- dle Jura ssic Polaten Formation. The pebbles in the Vetruska Formation come mostly from the Upper Triassic Rusinovdel and Tran Formations, and the Anisian-Ladinian Radomir Formation . The pebbles from the Radomir Formation yiel- ded conodonts which prove the conodont zones Pridael/a cornu/a R. Z ., Pridel/a excentrica J. Z. and Pri- daella bakalovi R. Z. The pebble content of the Vetruska Forma tion hints to the Ljubas unit (situated at northwest of the Golo-bardo unit) as the possible source area of the pebbles as far as the Lower Triassic and Lower Anisian formations in this unit are covered directly by Lower and Middle Jurassic formations thus indicating a deep Late Triassic erosion and denudation. This evidence disproves the ideas about a com- plete alochthoneity of the Golo-bardo unit. Introduction The Golo-bardo tectonic unit has been introduced as an allochthonous thrust sheet by r o- q e a (1983) who pointed at the differences between the Golo-bardo sequences and the AI- 35