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Swiss Journal of Geosciences
Fig. 7 | Swiss Journal of Geosciences

Fig. 7

From: A marine pebbly mudstone from the Swiss Alps: palaeotectonic implications and some consequences for the interpretation of Precambrian diamictites

Fig. 7

Field aspects of the Lower and Upper Sandstone. a Upper half of a massive and graded sandstone unit with hummocky cross beds on its upper surface (Lower Sandstone, NE slope of Spirstock). b Graded bed of coarse sandstone/breccia (base, below coin) overlain by a horizontally laminated sandstone unit (Lower Sandstone, NE slope of Spirstock). c Hummocky cross-stratification (below handle of hammer) at the base of the Upper Sandstone (NE slope of Spirstock) displaying the typical thickening of laminae into the crest. d Sharp contact between Upper Sandstone and Blockmergel (locality 4). e Upper Sandstone (southern slope of Spirstock, locality 5) displaying horizontal bedding and some low-angle (hummocky to swaley) cross stratification. f Upper Sandstone (locality 3) with an isolated channel structure within horizontally bedded sandstone

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