Estimated erection period Néolithique moyen (≈ 4100 av. J.-C.)
Dating of surrounding ceramic teasses.
2015
Discovery of the menhir
Discovery of the menhir 2015 (≈ 2015)
Unearthed during brush removal.
2 janvier 2017
Historical monument classification
Historical monument classification 2 janvier 2017 (≈ 2017)
Official protection by ministerial decree.
Aujourd'hui
Aujourd'hui
Aujourd'hui Aujourd'hui (≈ 2025)
Position de référence.
Heritage classified
The menhir, located 6 rue de la Montcient, at the place called Gaillonnet "Le Gros Murger", as well as the ground within a radius of 5 meters around it, as delimited in red on the plan attached to the decree (cad. AM 29): inscription by order of 2 January 2017
Key figures
Information non disponible - No character cited
Sources do not mention any historical actors.
Origin and history
The Menhir de Gaillonnet is a parallelepipedic limestone block measuring 3.16 metres high, of which 2 metres emerge from the ground. Located in Seraincourt in Val-d'Oise, it was discovered in 2015 during a brush removal. A search at its base revealed charcoals and ceramic teasses, while stone tools and other pottery fragments dated from the Middle Neolithic were found nearby. These discoveries suggest an ancient human occupation around the site.
Ranked a historic monument on January 2, 2017, this menhir is distinguished by its state of conservation and its almost intact archaeological context. The soil within a radius of 5 meters around the megalith is also protected, offering a rare opportunity to study neolithic practices and lifestyles. The property belongs to a private company, but its scientific interest motivated its rapid preservation after its discovery.
The research conducted by the Departmental Archaeology Service of Val-d'Oise underlines the importance of the site in understanding the megaliths of the region. The menhir, located at Le Gros Murger (6 rue de Montcient), is associated with ceramic and lithic remains that enrich the knowledge about the agricultural communities of Neolithic in Île-de-France. His ongoing study could reveal information on territorial rituals or markers of the time.
