Search publications of the members of the Royal Belgian institute of natural Sciences
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A Middle Devonian Callixylon (Archaeopteridales) from Ronquières, Belgium
- A permineralized Callixylon trunk is reported from Ronquières, a mid to late Givetian (Middle Devonian) locality from Belgium. The specimen consists of an 80 cm long trunk adpression whose central area is preserved as a pyrite permineralization. The pyritized area is composed of a eustele surrounded by secondary xylem. Tracheids show radially aligned groups of pits separated by unpitted regions on the radial walls of tracheids. The specimen belongs to a group of species characterized by a predominance of uniseriate rays and the lack of ray tracheids. This Callixylon specimen is one of the earliest representatives of the genus. It coexists at the locality with large cladoxylopsids and provides direct evidence that the tree habit had evolved in the archaeopteridalean progymnosperms by the Givetian.
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Impressions de visite entre Paléontologie et Anthropologie culturelle
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A Simple Type of Wood in Two Early Devonian Plants
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Diverse assemblages of Mid Devonian megaspores from Libya.
- A restudy of Devonian palynological assemblages of samples from the A1-69 borehole, drilled in the Ghadamis Basin, western Libya, North Africa has led to the discovery of numerous well-preserved megaspores amongst abundant miospores, rare acritarchs and rare chitinozoans. Thirteen samples from base to top, 1496 ft (456 m) up to 965 ft (294 m), contain the richest Devonian megaspore assemblages from northwestern Gondwana. The section is dated by a rich diverse miospore assemblage indicating the presence of the upper part of the AD pre-Lem Biozone up to the lower part of the TCo Oppel Zone, ranging from a latest Eifelian or earliest Givetian age up to a latest Givetian or an earliest Frasnian age. Seventeen megaspore taxa have been identified. Among them, two new species (Biharisporites lugardonii and Lagenicula milleri) and four new varieties (Corystisporites acutispinosus var. acutispinosus and var. bullatus, Heliotriletes longispinosus var. longispinosus and var. radiatus) are described. One new possible megaspore species is also described: Verruciretusispora labiosa sp. nov. One core sample (1293 ft, 394 m) contains several specimens of very large megaspores (ca. 1 mm), the largest known from Devonian localities (except for one specimen observed in the Givetian from Belgium). Among the 17 megaspore taxa from Libya, 6 are present on the Euramerican Continent. This observation is in accordance with previous palynological conclusions that favour the absence of palaeogeographic barriers between the Euramerican and Gondwanan continents that are suggested to be grouped together in a “Pre-Pangea” land mass.
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Nematode Morphology
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Desmoscolecida
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Journées annuelles 2012 : « La systématique au delà de la phylogénétique », 8-10 Octobre 2012, Paris. Compte rendu des journées.
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Journées annuelles 2010 : « La Biodiversité a-t-elle besoin de la Systématique ? ». Compte rendu des journées
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Journées annuelles 2011 : « Systématique et France d’Outre-Mer ». Compte rendu des journées
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Le Néolithique ancien de Belgique, autrement…
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Mons/Spiennes : datation de la minière ST 20 sur la parcelle 393c à «Petit-Spiennes»
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Mons/Spiennes : datation des puits profonds des minières du «Camp-à-Cayaux» de Spiennes
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Un fossé circulaire de l’âge du Bronze moyen au lieu-dit Champ de la Bruyère
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Rare Earth Elements and Sr-Isotopic Geochemistry: Tools to Determinate the Geological and Geographical Origins of Neolithic Fluorites [S14]
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Rare Earth Elements and Sr-Isotopic Geochemistry: Tools to Determinate the Geological and Geographical Origins of Neolithic Fluorites [S14]
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Structures rubanées isolées à Aubechies «Coron Maton» (Belœil, Hainaut occidental)
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Une hache-pendeloque néolithique en néphrite alpine découverte à Ouffet «Houp-le-Loup»
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Autour de l'hématite. Circulation et transformation au cours de la préhistoire récente : Méthodes d’analyse – About haematite. Procurement and transformation during recent prehistory: Analytical methods. Table ronde internationale – International works
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Haematite exploitation during the Neolithic in Belgium: archaeological contexts and questions
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Petrographical differentiation between Palaeozoic Oolitic ironstones from France, Belgium and Germany and application to the provenance study of archaeological artefacts – preliminary results
