{"refrec":{"BRefID":223882,"RR":"<b>Vanguestaine, M.</b> (1978). Critères palynostratigraphiques conduisant à la reconnaissance d'un pli couché Revinien dans le sondage de Grand-Halleux. <i>Ann. Soc. géol. Belg. (1968) 100</i>: 249-276","BEntID":215605,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Ann. Soc. Géol. Belg. (1968) 100</i>: 249-276","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Vanguestaine, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Vanguestaine, M.","Englishabstract":"The biostratigraphY based on palynology is given of the most important sections through the lower and middle Revinian of the Stavelot, Rocroi and Givonne massifs. Four assemblage-zones of interregional value are recognised. Assemblage-zone 4 (VANGUESTAINE, 1974) is subdivided into subzones 4a and 4b. The new biostratigraphic information confirms the earlier interpretation (VANGUESTAINE, 1968 and 1970) of black rocks recovered at the base of the Grand-Halleux borehole. They are of Revinian age and occur in a recumbent fold with a subdhorizontal axial plane.The palynological data combined with a lithological comparison of different sequences have shown that: 1.- there is a possible diachronism of lithofacies at the Rn1a-Rn1b boundary between the central part of the Stavelot massif and the overturned flank of the Revinian fold in the Grand-Halleux borehole; 2.- there may be diachronism of the quartzitic rocks at the base of Rn2a in the normal and overturned flanks of the same borehole; 3.- a condensed sequence or, possibly, even a stratigraphic gap exists at Revin (Rocroi massif) for the horizon corresponding to acritarch zone 3 and subzone 4a of the Stavelot massif; 4.- the Rv2b horizon is diachronous between the Rocroi and Givonne massifs. The stratigraphic distribution is given of several species selected on the basis of abundance, easily recognisable morphology and short ranges (Figs 3,6,8,9). Sorne species which are either rare, of undifferentiated morphology or long ranging, are treated separately in Annexe I. Four plates illustrate both common and rare species of the different zonal assemblages. Annexe II deals with two new genera: <i>Cristallinium</i> and <i>Timofeevia</i>, as well as one new species: <i>Timofeevia phosphoritica</i>; an additional two species, <i>Hemisphaerium</i> ? sp. A and <i>Timofeevia</i> sp. A, are newly described but left in open nomenclature. Four new specific combinations are proposed, viz. <i>Cristallinium cambriense</i> (SLAVIKOVA, 1968), <i>Elektoriskos cerinus</i> (VOLKOVA, 1968), <i>Timofeevia lancarae</i> (CRAMER et DIEZ, 1972) and <i>Timofeevia pentagonalis</i> (VANGUESTAINE, 1974).","AbstractOtherLang":"L'intervalle stratigràphique considéré dans le présent travail est celui qui a été qualifié de Cambrien \"moyen\" par BEUGNIES et al., 1976 sur la base des résultats auxquels aboutissent nos recherches palynologiques sur le Cambro-Ordovicien de Belgique et des regions limitrophes (VANGUESTAINE, 1973c et 1974). Il s'agit du Revinien inférieur, Rn1a et Rn1b, et de la partie inférieure du Revinien moyen, Rn2a, du massif de Stavelot, du Revinien inférieur, Rv1a et b, Rv2a et b et moyen, Rv3, du massif de Rocroi, du Revinien inférieur, Rv2a et b, et moyen Rv3 du massif de Givonne, ces notations étant prises dans un sens lithostratigraphique. Les travaux de GEUKENS (GEUKENS, 1952 ; ASSELBERGHS et GEUKENS, 1959 ; GEUKENS, 1963) sur la partie médiane du massif de Stavelot et ceux de BEUGNIES, 1960 et 1963 sur les massifs de Givonne et de Rocroi constituent le support stratigraphique de ce travail. La succession des évènements biostratigraphiques dans les principales coupes étudiées par ces deux auteurs est décrite ci-après, dans le but de préciser l'extensiontelle qu'elle est reconnue à ce jour- des zones (1) à Acritarches (VANGUESTAINE, 1974) correspondant à l'intervalle considéré. La succession biostratigraphique qui sera définie servira de fil conducteur à l'interprétation des faits palynologiques (VANGUESTAINE, 1968 et 1970) observés dans la partie profonde du sondage de Grand-Halleux, faits qui sont complétés par des informations nouvelles. 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