Geologica Belgica

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Michel VANGUESTAINE & Bastien WAUTHOZ

Acritarchs from the Abbaye de Villers and Tribotte Formations in their type section of the Thyle river valley (Middle Ordovician, Brabant Massif, Belgium) and their stratigraphic implications

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Mots-clés : Brabant Massif, Belgium, Acritarchs, Middle Ordovician

Abstract

Reinvestigation of the Thyle river section, in the southern part of the Brabant Massif, has led to a better understanding of acritarch distribution in the Middle Ordovician Abbaye de Villers and Tribotte formations, and their stratigraphical significance in the type localities of both formations. The middle and upper parts of the Abbaye de Villers Formation and the lower part of the Tribotte Formation yielded an acritarch assemblage corresponding to the Frankea hamata-Striatotheca rarirrugulata Acritarch Zone of the English Lake District, demonstrating a late Arenig (late Fennian, early Darriwilian) age. Two species, Adorfia firma and Arbusculidium filamentosum, not recorded in the overlying Rigenée Formation, probably have their last appearances below the Arenig-Llanvirn boundary. Acritarch (late Arenig, late Fennian) and chitinozoan datings (middle Arenig, Whitlandian pro parte) of the middle part of the Abbaye de Villers Formation suggest correlation with the older part of the Frankea hamata-Striatotheca rarirrugulata Acritarch Zone. The uppermost part of the Tribotte Formation shows palynological similarities with the overlying Rigenée Formation. The exact position of the Arenig-Llanvirn boundary in the Thyle river section is not yet known and does not necessarily coincide with the Tribotte-Rigenée lithostratigraphical boundary.

To cite this article

Michel VANGUESTAINE & Bastien WAUTHOZ, «Acritarchs from the Abbaye de Villers and Tribotte Formations in their type section of the Thyle river valley (Middle Ordovician, Brabant Massif, Belgium) and their stratigraphic implications», Geologica Belgica [En ligne], volume 14 (2011), number 1-2, 2-22 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=3186.

About: Michel VANGUESTAINE

Paléobotanique, Paléopalynologie, Microp Paléobotanique, Paléopalynologie, Micropaléontologie, University of Liège, Sart-Tilman B18, 4000 Liège, Belgium. (†Deceased 21.09.2006)

About: Bastien WAUTHOZ

Rue Grand Mont, 10, 6997 Soy, Belgium