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* Gravel conglomerate: Sediments with a conglomerate matrix and 15 - 50% gravel. 
* Gravel: Sediments in which 50 -100% of the particles are between 20 and 2 mm. 
* Gravelly sand: A sand matrix comprising 15 - 50% gravel. 
* Sand: Sediments in which 50 -100% of the particles are between 2 and 0.5 mm. 
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* Fine sand: Sediments in which 50 -100% of the particles are between 0.5 and 0.05 mm. 
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* Silt: Sediments composed of 50 to 100% detrital or biogenic particles between 0.01 and 0.05mm.
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Les caractéristiques sédimentaires du fond marin proviennent de données du Shom, du BRGM, de l'Ifremer, des Universités de Lille 1, Rouen, Caen, Brest, La Rochelle, Bordeaux I,  Corte et Perpignan, de l'IntechMer, du Conseil Départemental de la Charente-Maritime, de la Direction Départementale des Territoires et de la Mer de Charente-Maritime, de l'Office de l'Environnement de la Corse, et des Grands Ports Maritimes de Bordeaux et Marseille. Cette carte des sédiments superficiels est la synthèse des données recueillies par des moyens divers et variés : plomb suiffé, prélèvements à la benne et carottages, photographies aériennes et Litto3D (pour la frange côtière) et sous-marines, imagerie acoustique par sonar latéral et sondeur multifaisceaux sismique très haute résolution. Les cartes réalisées à partir de ces données ont été publiées sous forme de 45 cartes papier de 1990 à 2023 appelées cartes G.</gco:CharacterString>
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The sedimentary characteristics of the seabed come from data from the Shom, BRGM, Ifremer, the Universities of Lille 1, Rouen, Caen, Brest, La Rochelle, Bordeaux I, Corte and Perpignan, IntechMer, the Charente-Maritime Departmental Council, the Charente-Maritime Departmental Directorate for the Territories and the Sea, the Corsican Environment Office, and the Grand Ports Maritime of Bordeaux and Marseille. This map of surface sediments is the synthesis of data collected by various and varied means: lead sniffing, sampling and coring, aerial photographs and Litto3D (for the coastal fringe) and underwater, acoustic imagery by lateral sonar and very high resolution seismic multibeam sounder. The maps made from these data have been published as 45 paper maps from 1990 to 2023 called G charts.</gmd:LocalisedCharacterString>
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