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Origin and history

Le Grès de Saint-Méen is a megalithic polisher located in Talensac, Ille-et-Vilaine, Brittany. Although its name evokes sandstone, it is actually a block of ferrous shale measuring 3.72 metres long, 1.28 to 1.60 metres wide and 0.70 to 1.60 metres thick. Its upper face has about fifteen cups and transverse stripes, traces of an anthropogenic use during Neolithic.

The monument was classified as historical monuments by order of 14 May 1926, thus recognizing its archaeological importance. According to a local legend, Saint-Méen sharpened his axe on this stone before founding the village church, located at the location where the tool would have landed after being launched into the air.

Archaeological studies, including those of Paul Bézier (1883) and Jacques Briard (2004), confirm his role as a polisher, an essential tool for Neolithic communities in the manufacture and maintenance of stone tools. This type of monument illustrates the craft and ritual practices of the period, while at the same time testifying to the ancient human occupation in the region.

The precise location of the megalith, at the southeast edge of the Monfort Forest, is documented in the archives of the Merimée base under the cadastral reference A4. Its state of conservation and accessibility remain subject to assessment, with a location accuracy considered "fair" (level 5/10) depending on available sources.

The Saint-Méen sandstone is part of a larger set of megalithic sites in Ille-et-Vilaine, reflecting the density of prehistoric remains in Brittany. These monuments, often associated with local legends, play a key role in understanding neolithic societies and their relationship to the territory.

Finally, the protection of the site in 1926 highlights the early heritage interest for megaliths, long before the development of modern archaeology. Today, there remains a material testimony of the techniques and beliefs of the first sedentary communities in the region.

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