Fig. 4From: Petrophysical properties of the Muschelkalk from the Soultz-sous-Forêts geothermal site (France), an important lithostratigraphic unit for geothermal exploitation in the Upper Rhine GrabenBackscattered scanning electron microscope images showing the microstructure of the six Muschelkalk samples chosen to represent the variability of the Muschelkalk at exploration well EPS-1 (Soultz-sous-Forêts) (a–f), and three samples from the Buntsandstein at the Muschelkalk–Buntsandstein interface (g–i). The lithological unit, box number, and measured depth are given next to each imageBack to article page