Uses and economic interest of the chalk

The cliffs of chalk establish an exceptional tourist heritage, centered mainly on the site of Etretat.
The chalk is also a natural material in the base of the manufacturing of the cement and the lime, but the extraction of which is limited inside lands.
The chalk is a fundamental aquifer in all Paris Basin. The harnessings and the drillings of the water supply also concern the inside of lands, but the numerous sources and the littoral exemergencies illustrate well the modalities of traffic of subterranean waters.