See also: Wallers (homonymy)
Wallers-in-Fagne , in the past Wallers-Trélon , is a common French, located in the department of the Northern and the area Nord-Pas-de-Calais.
Located on the periclinal termination of the calcareous structure which constitutes the Belgian Calestienne, Wallers-in-Fagne has outcrop of level givétien from where is extracted a blue limestone, known as wrongly “blue marble”.
This blue limestone constitutes a typical element in the local architecture of the houses of Thiérache of North (Avesnois), the Fagne, and part of the Ardennes, Chimay to Givet.
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