Timeline

Heritage classified

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Origin and history

The Dolmen du Champ-Grosset, discovered in 1894 by M. de Tournemine in Quessoy (Côtes-d'Armor), is a megalithic covered alley dated from Neolithic. Ranked historic monument in 1896 after excavations conducted by A. Anne-Duportal, it reveals a funerary furniture (vases, polished axes, flint blades) linked to the Seine-Oise-Marne and Armoric cultures. Its structure, 12.90 m long, includes 23 orthostates of local granite and six roof tables, surrounded by a partially preserved cairn.

The 1963-1964 excavations, led by Jean L-Helgouach, specified its architecture: a probable lateral entrance, an annex chamber to the east, and a slab height estimated at 1.20 m. The coals collected in 1964, dated about 1,870 B.C. (final Neolithic), confirm its long-term funeral use. The monument illustrates Breton megalithic traditions, with a cairn not covering the tables but stopping at the support level.

Archaeological furniture, including shale discs interpreted as weights, and a pressignian-type blade, highlights the cultural exchanges of the era. The site, excavated under the aegis of the Cote d'Armor demulation society, remains a major testimony of neolithic burial practices in Brittany, combining monumental architecture and funeral offerings.

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