By the 19th century, it was in high demand. The quarry basin today covers 2,500 ha and is known far and wide. Take the trail around the quarry and discover its almost lunar landscape. The museum of marble and geology in Rinxent, at the heart of the quarry basin, retraces over three-hundred million years of the geological history of the Boulonnais. The copse land has a two-thousand year agrarian heritage.
Some hedges still show signs of the ancient hedge-weaving tradition.
The thickets were folded over horizontally so that they could grow leaves down to the ground. In the middle ages, monks cleared the ancient Morinie forest but kept the selvage for hedgerows. The Boulonnais copse land is fairly densely farmed. The Boulonnais Tour. The tour, organized by the Park administration, starts from Desvres and crosses the heart of the copse land where you can admire sheltered 17th century manors and typical whitewashed houses.