The Wildegg Formation is dominated by an alternation of (argillaceous) limestone and calcareous marl successions which have similar characteristics over Northern Switzerland (Fig. 4‑48). However, the thickness of the entire formation and its individual stratal successions decreases strongly from west to east in the study area. Some of these successions can be partly correlated over large distances of more than 25 km (Deplazes et al. 2013). The most prominent limestone succession, the Gerstenhübel Bed, may even be correlated over the entire study area, although its thickness and facies change laterally. Additionally, especially in the interval below the Gerstenhübel Bed, the correlation of the succession is less clear compared to the interval above the Gerstenhübel Bed.