The general facies variability determined by sulphatic, argillaceous and dolomitic intercalations in the Bänkerjoch Formation is similar and is correlatable between all boreholes of the siting regions (Fig. 4‑11). For example, the interval with massive anhydrite in the lowermost part of the Bänkerjoch Formation is very well expressed and can be traced well laterally (defined by low clay-mineral contents between 237_Lad_300 and 237_Lad_200). However, in detail the expression, thickness and number of the lithological cycles vary depending on local conditions in the former sabkha environment. Additionally, lateral differences exist in the uppermost subunit where the overlying fluvial facies of the Ergolz Member (Klettgau Formation) is separated from the Bänkerjoch Formation by an erosional unconformity as observed in the TRU1 borehole.