GEOLOGICA BALCANICA, 34. 1-2, Sofia, Jun. 2004, p. 11-20 IU S UNES 0 IGCP Project 469 Review of the late Westphalian -early Stephanian macrofloras of the Dobrudzha Coalfield, Bulgaria Christopher J. Cleal 1 , Yanaki G. Tenchov 2 and Erwin L. Zodrow 3 1 Department of Biodiversity and Systematic Biology, National Museums and Galleries of Wales, Cathays Park, CardiffCF10 JNP, Unit ed Kingdom (E-mail: chris.cleal@nmgw.ac.uk). 2 Geologicallnsitute, Bulgarian Academy of Sciences, A cad. G. Bonchev Street, Block 24, Sofia 1113, Bulgaria (E-mail: ytenchov@abv.bg) 'Department of Geology, University College of Cape Breton, Sydney, Nova Scotia, Canada 8/ P 6L2 (E-mail: Erwin_Zodrow@uccb.ns.ca) Kpucmorjiep K11UU/l, JlftaKu Ten4oe, lfpeun 3oi)poy - 06J op nOJdHeeecmrjiallbCKou - paunecmerjiaucKou MaK- . o¢.wpbt !{o6pyd:>ICaHcKoco KaMeflltOJcOilbnoco 6acceu- Ha, Ceeepo-Bocmo4HaR EollCapuR. MaKpolflnopa ro secTiflanR- paHHero cTe$aHa s Ka- MeHHoyroJi hHOM 6acceiiue HMeeT o61.l{Hx oco6ermoc - ei{ c cospeMeHHhJMH coo61.l{ecTBaMH IO)l(HOH AurnHH H KaHa.UCKHX npH6pe)l(HblX paHOHOB, HO B HHX ycTaHaBJIH- 3aJOTCSI TaK)l(e HeKOTOphle TaKCOHhl, KOTOphle HOpMaJibHO accOUHHpyroT c 4Jnopoi1 6onee BbiCOKO pacnoJIO)l(eHHhix 6acceiiHos KaK CaapcKo-JloTapHHrCKHH H QeHTpaJibH0- 3TH xoporno comacyroTCR c lflaKTOM, 'ITO 6acceiiH Ha OKpaHHe sa- pi! U HHCKOfO XOTR MO)l(eT 6b1Tb OH H 6hiJI pz no;lO)l(eH cpaBHHTeJJhHO Bhtwe 6onee Ja- :Ia.:IHbL"< KaMeHHOYfOJlhHhiX 6acCeHHOB. 0Ka3aJJOCh, 'ITO B H eM nposeCnl Te OCHOBHhie 6H030HaJihHbie rp a- .illiilbl, KOTOphre 6hiJIIi nepBOHatfaJJhHO ycTaHOBJJeHhl 11 B 3ana..:rnoi1 Espone, H s CesepHoii AMepHKe. Laveineopteris n'nerl'is s yrmrx m 5 C3HTb.l . OcHosa 30HhJ Linopteris bunburii (T.e. ocHosa -ecT$a..lSI D) s yrnRX n 3 KpyneHcKoii csHThi. rlo..Tb30Ha Lobatopteris micromiltoni oTcyTcTsy- e-T B CBli3H C HapyrneHHeM 32Te.l:hHOCTii, Ho Dick sonites plueckenetii BhiliB- ..:am s fypKOBCKOH CBHTe . .[J,aHHhie o HaJIHtflili 30Hhi Odon- eris cantabrica (rpaHHUa secTiflamt H CTelflaHa) Haxo- .J.fl"CH B YTJijjX p 7 - B BepXHHX fypKOBCKOH CBHTbl. Abstract. The late Westphalian- early Stephanian macroflo- ras of the Dobrudzha Coalfield show many similarities with the contemporaneous lowl and assemblages from southern Britain and the Canadian Maritimes, but there are also present some taxa normally associated with more upland ba- sins such as Saar-Lorraine and Central Bohemia. This is in agreement with the Dobrudzha Coalfield occupying a mar- ginal pos ition on the Variscan Foreland, perhaps at higher al- titudes than the more western coalfields. It has been possible to identify the main biozonal boundaries that were originally established in western Europe and eastern North America. The base of the Laveineopteris rarinervis Subzone occurs at coal m 5 in the Makedonka Formation. The base of the Linop- teris bunburii Zone (indicat ing the base of the Westphalian D Stage) is at coal n 3 in the Krupen Formation. The Lobatop- teris micromiltoni Subzone seems to be absent due to a non- sequence, · but the Dicksonites plueckenetii Subzone is in the Gurkovo Formation. Evidence of the Odontopteris cantabri- ca Zone (indicating the Westphalian- Stephanian boundary) occurs at coal p 7 in the upper Gurkovo Formation. O eal. C. J., Tenchov, Y. G., Zodrow, E. L. , 2004. Review of the late Westphalian- early Stephanian m rotloras of the Dobrudzha Coalfield, Bulgaria. - Geologica Bale., 34, 1-2; 11-20. Key words: Bulgaria, Dobrudzha Carboniferous, macroflora, floristics, biostratigraphy. 11