Prochain point : lat="49.1324" lon="2.05986"
A landscape of great cultures and woods interrupted by valleys.
A village dominating a hilly landscape
After being named Griscium (1092), Grisacium (1249) then Grify, Grisie and Gresy, the village became Grisy-les-Plâtres in 1870, due to gypsum quarry operations. The village is situated on the mound of Epiais-Grisy, as the plateau was occupied by large plots assigned to cereal crops. “Wooded tongues” follow the contour lines and the sinuous valleys. The first houses were situated in the Berval's hamlet. The creation of the Pontoise-Gisors road encouraged residents to settle along this new link, around the Saint-Caprais church (built in the 8th century). The old site is made up of rural houses and old, small farms built with stones that were extracted locally. This Lutetian predominantly grey limestone provides the identity of the traditional dwellings.
Rosne's mounds
With the highest point at 217 metres above sea level, these outcrops confirm the presence of the sea 30 million years ago. They overlook the plateau of the French Vexin area and the municipalities of Haravilliers, Le Heaulme, Neuilly-en-Vexin, Chavençon and Neuville-Bosc. Waterproof clay and marl layers can be found at the base, surmounted by a thick layer of Rupelian sand. At their contact, lots of springs spout to flow into the Sausseron. The top is formed by slabs of gritstone. The originality of these mounds lies in the presence of several sub-mountainous environments. Today, the forest cover, originally consisting of oaks, is composed of hornbeams, alders and sweet chestnut. Rosne's mounds have been classified since 1996 for their considerable landscape value. They are also indexed by the ZNIEFF (Natural area of particular interest in terms of fauna and flora).
Large isolated farms
Laire (Bréançon) and Berval (Grisy) farms are isolated on the plateau. They are situated on the hillside and they can only be reached by rural paths. They resemble imposing fortresses due to their closed quadrilateral set up. Laire farm was built in the 18th century. Today this old manor farm that has a beautiful dovecote with 2800 holes, has turned to the livestock farming, with 240 Charolais cows. Berval farm was built at the end of the 18th century. Both farms offer boarding for horses in meadows or in boxes.
