The Malm Group above Wildegg Formation overlies the upper confining units of the host rock. It forms the Malm aquifer in NL and ZNO; in JO this aquifer exists in part of the siting region at shallow level (Section 4.5.3.3, Fig. 4‑50). The sedimentary succession was deposited during the Late Jurassic in a shallow marine epicontinental sea (Chapter 3).

Fig. 4‑50:Map of depositional environments during the Late Jurassic (Late Oxfordian to Early Tithonian) preserved in the Malm Group above Wildegg Formation

Refer to Fig. 4‑3 for a schematic representation of depositional environments. The north arrow refers to present-day geographic north.