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Fig. 2 | Geothermal Energy

Fig. 2

From: Characterizing the physical properties of rocks from the Paleozoic to Permo-Triassic transition in the Upper Rhine Graben

Fig. 2

Photos of the field locations from which the rock samples were taken. The dominant lithologies at each site are indicated. a Waldhambach, Germany. b Albersweiler, Germany. c Saint Pierre Bois, France. d Saint Pierre Bois, France. Note the fractures present in the granite become arrested at the sandstone–granite interface. e Saint Pierre Bois, France. Note the alternating sandstone and clay units. f Raon l’Etape, France. g Raon l’Etape, France

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