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Angoumian
The Angoumian is a Geology, geological Group (stratigraphy), group restricted to the northern Aquitaine Basin in France. The group consists of two fossiliferous limestone Formation (stratigraphy), formations deposited during the Turonian. Etymology The name Angoumian, in French language, French ''Angoumien'', is derived from the ''Angoumois'' region around the town of Angoulême in the Charente (département), Charente. Occurrence The formation crops out in the surroundings of Angoulême, but also reaches farther south into the Dordogne (département), Dordogne (Périgord, i.e. Périgord Vert & Périgord Blanc). Stratigraphy The Angoumian is usually divided into two formations, a lower ''Angoumien inférieur'' and an upper ''Angoumien supérieur''. Some authors even attribute the Ligerian (in French ''Ligérien'') to the Angoumian and then call it ''basal Angoumian''. The Angoumian ''sensu stricto'' conformably overlies the Ligerian and closes with a hardground towards the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquitaine Basin
The Aquitaine Basin is the second largest Mesozoic and Cenozoic sedimentary basin in France after the Paris Basin, occupying a large part of the country's southwestern quadrant. Its surface area covers 66,000 km2 onshore. It formed on Variscan basement which was peneplained during the Permian and then started subsiding in the early Triassic. The basement is covered in the Parentis Basin and in the Subpyrenean Basin—both sub-basins of the main Aquitaine Basin—by 11,000 m of sediment. Geography The Aquitaine Basin, named after the French region Aquitaine, is roughly funnel-shaped with its opening pointing towards the Atlantic Ocean. Here it meets for 330 km the straight, more or less north–south-trending Atlantic coastline but continues offshore to the continental slope. To the south, it is delimitated for 350 km by the west-northwest–east-southeast trending Pyrenees. In the southeast, the basin reaches the Seuil de Naurouze (also called ''Seuil du La ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |