Geologica Belgica

1374-8505

 

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Alain PREAT, Pierre BULTYNCK & Denise BRICE

GIVETIAN

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Mots-clés : tidal flats, KEYWORDS: Givetian, lagoons, patch reefs, coralgal banks, carbonate platform.

Abstract

Abstract. The Givetian Stage in the Givet area is represented by the main part of the Hanonet Fm, the Trois-Fontaines Fm, the Terres d'Haurs Fm, the Mont d'Haurs Fm, the Fromelennes Fm and the lowest part of the Nismes Fm. During Eifelian-Givetian transition, the sedimentary systems evolved from a mixed siliciclastic-carbonate ramp to a carbonate platform dominated by cyclic tidal-flat and lagoonal wackestones with local patch reefs or coralgal banks. The shelf had an ESE-WNW trend and extended from the Avesnois basin (northern France) in the west to Aachen (western Germany). The sedimentation in the Ardennes consists of shallow water regressive metric (around 5 m or less) cycles. Stromatopores, corals, brachiopods, algae and cyanobacteria are abundant. Due to this general shallow water setting, the base of the Givetian Stage has been defined by the IUGS Subcommission on Devonian Stratigraphy in a GSSP in southern Morocco referring to the first occurence of the condodont species Polygnathus hemiansatus. The conodont species Icriodus obliquimarginatus appears approximately at the same level in Belgium.

To cite this article

Alain PREAT, Pierre BULTYNCK & Denise BRICE, «GIVETIAN», Geologica Belgica [En ligne], volume 9 (2006), number 1-2 - Chronostratigraphic units named from Belgium, 9-18 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=1063.

About: Alain PREAT

Université Libre de Bruxelles, Département des Sciences de la Terre et de l’Environnement, Géologie-CP160/02, 50 av FD Roosevelt, B 1050 Bruxelles, Belgique; E-mail: apreat@ulb.ac.be.

About: Pierre BULTYNCK

Royal Belgian Institute of Natural Sciences, Department of Palaeontology, Vautierstraat, 29, B-1000 Brussels, Belgium; E-mail: pierre.bultynck@belgacom.net.

About: Denise BRICE

Laboratoire de Paléontologie stratigraphique, Faculté Libre des Sciences, rue de Toul, 13, F-59046 Lille cedex, France; E-mail: denise.brice@fls.fupl.asso.fr.