Fig. 13

Bonaduz Formation at outcrop. A Detailed view of gravel within the Bonaduz Formation in the Reichenau gravel pit. Note the lack of any sign of stratification. B Pavoni pipe in the Reichenau gravel pit with near vertical elutriation in the Bonaduz Formation. C Large rip-up clast of silt within the Bonaduz Formation in the Reichenau gravel pit. D The plain with the villages Bonaduz and Rhäzüns corresponds to the top of the Bonaduz Formation. In the foreground two large rock avalanche fragments are exposed along the Hinterrhein. To the right a synformal structure within Jurassic sediments and to the left middle Jurassic sediments. Between the two fragments gravel of the Bonaduz Formation forms a steep cliff. Bo: Bonaduz Formation, Do: middle Jurassic sandstone (Dogger), Ma: upper Jurassic Schilt formation (Malm). Photos A. Pfiffner.