Sous l'argile fertile se trouve ici une couche de calcaire perméable à l'eau. Les Romains utilisaient ce calcaire (appelé "margelle" dans le dialecte local) dans leurs constructions. Lors de la construction de nombreuses églises de Haspengouw, y compris la basilique de Tongres, les pierres calcaires de Heerse se sont révélées très utiles. Entre 1930 et 1960, on a cultivé des millions de champignons dans ces anciennes carrières de margelle. Maintenant, ces grottes (également appelées "puits de margelle") constituent l'un des principaux lieux d'hivernage pour les chauves-souris en Europe de l'Ouest.
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