Geologica Belgica


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volume 8 (2005) -- number 4 (Avalonia-Moesia volume)

Type de document : Article

Jan VANMEIRHAEGHE, Annelies Storme, Koen Van Noten, Geert van Grootel, Jacques VERNIERS

CHITINOZOAN BIOZONATION AND NEW LITHOSTRATIGRAPHICAL DATA IN THE UPPER ORDOVICIAN OF THE FAUQUEZ AND ASQUEMPONT AREAS (BRABANT MASSIF, BELGIUM)

Abstract

A chitinozoan biozonation is established for the Upper Ordovician rocks of the Sennette valley in the Fauquez area and the Asquempont area, revising the existing chitinozoan biozonation of the Brabant Massif. The chitinozoans of five formations (the Ittre, Bornival, Huet, Fauquez and Madot formations) are studied from 70 samples. The chitinozoan biozonation is correlated with Baltoscandia and the Avalonian Upper Ordovician type sections in the U.K. This correlation provides an accurate dating of the studied formations. A megaslumping event, affecting a part of the Ittre and Bornival Formation and causing the overturning of a pile of sediments estimated at minimum 200 m thick, may be placed in the mid Oandu (Cheneyan, middle Caradoc, early “Stage 6�). The volcanic rocks in the Fauquez area, formally thought to be restricted to the Ashgill, are confined to the late Caradoc - early Ashgill timespan. In addition to this, this paper presents new lithostratigraphical data on the Ittre Formation and the lower member of the Bornival Formation.

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Pour citer cet article :

Jan VANMEIRHAEGHE, Annelies Storme, Koen Van Noten, Geert van Grootel & Jacques VERNIERS. «CHITINOZOAN BIOZONATION AND NEW LITHOSTRATIGRAPHICAL DATA IN THE UPPER ORDOVICIAN OF THE FAUQUEZ AND ASQUEMPONT AREAS (BRABANT MASSIF, BELGIUM)». Geologica Belgica, volume 8 (2005)  number 4 (Avalonia-Moesia volume) : 145-159
http://popups.ulg.ac.be/Geol/document.php?id=805
Les auteurs : 
Jan  VANMEIRHAEGHE

Palaeontology Research Unit, Ghent University, Krijgslaan 281/S8, B-9000 Gent, Belgium, E-mail: Jan.Vanmeirhaeghe@UGent.be.

Annelies  Storme

Palaeontology Research Unit, Ghent University, Krijgslaan 281/S8, B-9000 Gent, Belgium.

Koen Van  Noten

Palaeontology Research Unit, Ghent University, Krijgslaan 281/S8, B-9000 Gent, Belgium, Present address: Structural Geology & Tectonics Group, Katholieke Universiteit Leuven, Redingenstraat 16, B-3000 Leuven, Belgium.

Geert van  Grootel

Palaeontology Research Unit, Ghent University, Krijgslaan 281/S8, B-9000 Gent, Belgium.

Jacques  VERNIERS

Palaeontology Research Unit, Ghent University, Krijgslaan 281/S8, B-9000 Gent, Belgium.

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