Sedimentologie paleoecologie et paleontologie des calcaires crinoidiques au voisinage de la limite couvinien-givetien a Wellin
Coen-Aubert, M; Mamet, M; Préat, A.; Tourneur, F (1991). Sedimentologie paleoecologie et paleontologie des calcaires crinoidiques au voisinage de la limite couvinien-givetien a Wellin. Toelichtende Verhandelingen voor de Geologische Kaart en Mijnkaart van België = Mémoires pour servir à l'explication des cartes géologiques et minières de la Belgique, 31. Geologische Dienst van België: Brussel. 61 p., 16 pl. pp.
Deel van: Toelichtende Verhandelingen voor de Geologische Kaart en Mijnkaart van België = Mémoires pour servir à l'explication des cartes géologiques et minières de la Belgique. Belgische Geologische Dienst: Bruxelles. ISSN 0408-9510, meer
The sedimentology of the Eifelian-Givetian boundary beds in the Wellin area indicates a transition from a siliciclastic-carbonate ramp to a gently sloping carbonate platform lacking a true reefal barrier. Prograding decametric sedimentary units form a littoral accretion megasequence. Corallian megafauna and algal microflora are highly diverse and abundant. Several communities are recognized in the ramp but they cannot be used for precise chronostratigraphic correlations.Comparison with other regions of the Dinant Synclinorium shows that the basin was already partitioned into blocks in Late Eifelian time. In Early Givetian several blocks of plurikilometric extension are identified. In this context, recognition of a new formation, provisionnally called "Formation X", between the Jemelle and Hanonet Formations, is significant.This local unit, some 120 meters thick, is composed of crinoidal and reefal limestones and indicates the existence of a sharply subsiding block in the Wellin area.
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