Greywacke Zone

The roadcut displays a very nice alternation between Schwarzphyllites and light phyllites of the Greywacke Zone. The Schwarzphyllites originated from dark, clayey sediments of an ocean basin. The dark color is attributed to organic components (dead plants or microorganisms).

The light phyllites also originated from sediments of an ocean basin, but without organic substance and with a higher sand content, both indicative of originally coastal deposits.

Several faults offset the phyllite in the form of so-called Horst-and-graden structures. The bending of the foliation surface ("dragging") also indicates the direction of movement. All faults are normal faults, movements caused by extension. Similar, the quartz-filled extensional fractures can be understood. These also resulted from extension, but higher temperatures (approxmiately 300 degrees Celsius).

The alternation between Schwarzphyllites and light phyllites exhibits different extensional structures:
- Quartz-rich layers that have been torn apart
- So-called boudins (from French „boudin" for blood sausage), which form due to the ex- tension of layered rocks. Here, the dark layers break down into typical ellipsoidal shapes surrounded by the surrounding light phyllite.