The layers of limestone and conglomerate
The Montmartin limestone, recognisable by its fine grain and light blue tone, constitutes the highest part of the landscape situated in front of you. The limestone is layered on reddish conglomerate or grey sandstone. You can easily recognise these rocks in the walls that you walk past.
Montmartin limestone resurgences and springs
The high part of the landscape is permeated by a vast network of water courses, infiltrating through the Montmartin Limestone. These springs appear at the ground surface at the junction with the conglomerate and the sandstone.
The uses of limestone
Construction: The castle, church and the village of Regnéville are built from Montmartin limestone, sandstone or reddish conglomerate. On the higher parts of the landscape, the buildings are constructed almost exclusively from limestone.