Overview of a thin section across one of the flattened pebbles (sample MTS5) of the bed shown in Figure 6D. S_m: regional foliation molded on the pebble in the pressure shadow. The matrix is calcite-rich, whereas the pebble shows a feldspar-rich brownish part and a quartz-rich, lighter layer. The dark, foliated aureole (rim) around the pebble mainly consists of quartz–calcite intergrowths.