Fig. 1

Simplified geological map of the eastern part of the Eastern Alps, the pre-Neogene basement of the Vienna Basin, and the western part of the West Carparthians, with Gosau Group situated at the border of (in the Northern Calcareous Alps), and underneath, the Neogene Vienna Basin (modified after Wessely et al. 1993; Wagreich and Marschalko 1995; Zimmer and Wessely 1996). Sampled locations of wells and outcrops are marked with stars, with the sample numbers (Table 1). Suggested nappe structure of the NCA subcrops are slightly modified after Wessely et al. (1993). BN Bajuvaric nappes, TN Tirolic Nappes, HN higher NCA nappes