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Origin and history

The menhir d'Oisy-le-Verger, also known as the Gros Caillou, is a stone block located in the commune of Oisy-le-Verger, in the department of Pas-de-Calais. This megalithic monument is now in the middle of a dry and planted marsh, but its initial erection took place on a clay-glaise soil. Over the course of the Holocene, this land gradually collapsed to form a swamp in connection with the Sensée River. Menhir has natural depressions, including a circular hollow of 0.50 m in diameter facing south, potentially related to solar considerations. Its north face has two oblong cavities, sometimes interpreted as a stylized representation of bovid foot.

According to a local tradition, the menhir would sink into the ground every year and would already be buried over 8 meters deep. This legend reflects popular beliefs associated with megaliths, often perceived as mysterious objects or with powers. The monument was classified as historical monuments on 26 January 1981, recognizing its heritage and archaeological value.

Studies on this menhir are based on the work of Léon Desailly, published in 1923 in the Bulletin de la Société préhistorique de France. This research places the monument in a larger megalithic complex, linked to the Sensée River and the regional prehistoric context. The site illustrates the ancient occupation of the territories of Nord-Pas-de-Calais, where the megaliths probably served as landmarks or symbolic places for the Neolithic communities.

The protection of menhir in 1981 preserved this material testimony of prehistoric practices and beliefs. Its present state, although modified by the drying of surrounding marshes, offers an overview of the techniques of erection and the choices of implantation of megaliths. Interpretations of the menhir cavities and orientation remain open, inviting further research into its exact function.

Folklore associated with Gros Caillou, like its progressive sinking, recalls mythological narratives often attached to stones erected in Europe. These legends underline the cultural importance of these monuments, far beyond their mere material aspect. Today, the Menhir of Oisy-le-Verger is a point of interest for the study of megalithism in the Hauts-de-France and for the understanding of the region's ancient landscapes.

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