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Overview of the Jura rocks
Jura is made up of limestone rocks, therefore generally permeable, which have difficulty in retaining water. Its complex karstic system alternates between limestone and marl banks which determine the presence or absence of surface water. The areas of limestone outcrops are characterized by an infiltration of the atmospheric waters towards the underground hydrographic network while those of impermeable marl outcrops return water to the surface hydrographic network.
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