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Cellules polygonales de la Chaussée des Géants - Irlande du Nord
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La Chaussée des Géants forme un promontoire qui s'avance sur la mer ; il est constitué de la juxtaposition de prismes de lave refroidie. La plupart ont une section de forme hexagonale, mais environ 30 % sont des pentagones et certaines colonnes ont quatre, sept, huit voire neuf ou dix faces. La section des prismes peut avoir une surface plane, convexe ou concave. L'ensemble évoque une chaussée ancienne au pavage irrégulier.
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