Inclusions of conifers,echinoids, foraminifers and sponges in flints from the Cenomanian of Charente-Maritime (France): Contribution of synchrotron microtomography |
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Affiliation: | 1. Université Rennes 1, CNRS UMR 6118 Géosciences Rennes, campus de Beaulieu, bâtiment 15, 263, avenue du Général-Leclerc, 35042 Rennes, France;2. European Synchrotron Radiation Facility, 6, rue Jules-Horowitz, BP 220, 38043 Grenoble, France;3. Université Lyon-1 (Claude-Bernard), CNRS UMR 5276 LGL-TPE, Campus La Doua, bâtiment Géode, 43, boulevard du 11-Novembre-1918, 69622 Villeurbanne, France;4. GIP-GEVES (Groupement d’Étude et de Contrôle des Variétés et Semences), Le Magneraud, 17700 Surgères, France |
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Abstract: | Deposits containing silica-rich nodules were recently collected from the Font-de-Benon quarry, between Archingeay and Les Nouillers, Charente-Maritime, western France. Nodules contain diverse fossil inclusions such as conifers, urchins, foraminifers and sponge spicules. Cenomanian deposits were transformed during the Eocene-Oligocene by a delayed silicification. This occurred under a warm climate and a long pedogenic alteration. X-ray synchrotron tomography was used to locate and produce three-dimensional reconstruction of flint fossil inclusions. The plant fossils constitute an unusual case of late permineralization. The conifer and invertebrate fossil assemblage suggests a coastal palaeoenvironment close to a forest. |
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Keywords: | Plants Echinoids Sponges Flints Permineralization Synchrotron microtomography Mid Cretaceous Western France Plantes Échinides Éponges Silex Perminéralisation Microtomographie synchrotron Crétacé moyen Ouest de la France |
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