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Stratigraphie et faune d’un puits d’extraction néolithique à Petit-Spiennes
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L'étude de la stratigraphie combinée à celle de la faune d'un puits d'extraction de silex, fouillé entre 1997 et 1999 à Petit-Spiennes, tente de retracer l'histoire détaillée du comblement d'un puits afin d'y rechercher des indices relatifs au travail minier. Elle montre que le comblement ne doit pas être conçu comme un événement synchrone mais doit se mesurer, au minimum, en terme de mois dans un environnement qui, lui, reste stable. La faune - et parmi celle-ci, surtout, les petits vertébrés intrusifs recueillis sur toute la hauteur du puits d'accès ainsi que les gastéropodes, - indiquent un milieu semi-forestier marqué par la présence de la Trouille. La découverte d'éléments fcetaux d'animaux domestiques suggère la pratique de lélevage dans un périmètre relativement proche de la mine e! par là même, celle d'un habitat aux alentours de 4500 8.P., époque du comblement de la structure. La stratigraphie offre, enfin, une illustration de phénomènes de tassement, décrits précédemment dans la littérature, ainsi que dévénements post-dépositionnels particuliers qui posent le problème du déplacement de certains restes dans un espace en théorie colmaté.
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RBINS Staff Publications
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Stratigraphie, nannofossiles calcaires et foraminifères de la coupe du ruisseau de Lespontes à Saint-Lon-les-Mines (Eocène moyen et supérieur d’Aquitaine, France).
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RBINS Staff Publications
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Stratigraphy and depositional environments of the Late Famennian (Late Devonian) of Southern Belgium and characterization of the Strud locality
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The Famennian (Upper Devonian, c. 372 to 359 Ma) strata of Belgium have recently received much attention after the discoveries of early tetrapod remains and outstandingly preserved continental arthropods. The Strud locality has yielded a diverse flora and fauna including seed-plants, tetrapods, various placoderm, actinopterygian, acanthodian and sarcopterygian fishes, crustaceans (anostracans, notostracans, conchostracans and decapods) and a putative complete insect. This fossil assemblage is one of the oldest continental – probably fresh-water – ecosystems with a considerable vertebrate and invertebrate diversity. The study of the palaeoenvironment of the Strud locality is crucial because it records one of the earliest and most important phases of tetrapod evolution that took place after their emergence but before their terrestrialization. It raises the question of environmental and ecological conditions for the Devonian aquatic ecosystem and the selection pressures occurring at the onset of tetrapod terrestrialization. The present study characterized the fluvial facies of the Upper Famennian sedimentary rocks of Strud and the surrounding areas. The exceptional preservation of arthropods and plants in the main fossiliferous layers is explained by rapid burial in the fine-grained sediment of the quiet and confined flood plain environment. Newly investigated fossiliferous sections in the Meuse–Samson area led to the description and correlation of key sections (Strud, Wierde and Jausse sections, complemented by the less continuous Haltinne, Huy and Coutisse sections). Moreover, the investigated sections allowed a review of the age of the fossiliferous horizon, which is now definitely considered to be Late Famennian in age.
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RBINS Staff Publications 2016
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Stratigraphy of an early-middle Miocene sequence near Antwerp in Northern Belgium (Southern North Sea Basin)
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RBINS Staff Publications
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Stratigraphy, sedimentology and palaeoecology of the dinosaur-bearing Kundur section (Zeya-Bureya Basin, Far Eastern Russia)
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RBINS Staff Publications
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Stratigraphy, structure and evolution of the European continental margins
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RBINS Staff Publications 2019
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Stress-state evolution of the brittle upper crust during compressional tectonic inversion as defined by successive quartz vein types (High-Ardenne slate belt, Germany)
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In the frontal part of the Rhenohercynian fold-and-thrust belt (High-Ardenne slate belt, Germany), two successive types of quartz veins, oriented normal and parallel to bedding respectively, are interpreted to reflect the early Variscan compressional tectonic inversion of the Ardenne–Eifel sedimentary basin. Fracturing and sealing occurred in Lower Devonian siliciclastic multilayers under very low-grade metamorphic conditions in a brittle upper crust. A geometrical and microthermometric analysis of these veins has helped to constrain the kinematic and pressure–temperature conditions of both vein types, allowing the reconstruction of the stress-state evolution in a basin during tectonic inversion. It is demonstrated that bedding-normal extension veins, which developed under low differential stresses and repeatedly opened and sealed (crack-seal) under near-lithostatic fluid pressures, reflect the latest stage of an extensional stress regime. Bedding-parallel veins, which developed at differential stresses that were still low enough to allow the formation of extension veins, cross-cut the bedding-normal veins and preceded the regional fold and cleavage development. These veins show a pronounced bedding-parallel fabric, reflecting bedding-normal uplift and bedding-parallel shearing under lithostatic to supra-lithostatic fluid pressures during the early stages of a compressional stress regime. This kinematic history corroborates that fluid overpressures are easy to maintain during compressional tectonic inversion at the onset of orogeny.
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No RBINS Staff publications
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Strontium
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RBINS Staff Publications 2024
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Structure and Classification
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RBINS Staff Publications
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Structure and dynamics of the arboreal nesting termite community in New Guinea coconut plantations.
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No RBINS Staff publications
