Schwarze Wand Nickenich

The Eppelsberg is a cinder cone volcano that spewed lava 230,000 years ago.
A second volcanic eruption led to the light-colored tuff deposits.
During the third lava eruption, the "black lava band" and above it the "colorful layers" developed in intervals of eruptions and resting phases. The eruption of the Laacher See volcano 12,900 years ago added a layer of pumice on top.
Step-like rock slides are a special feature of the Eppelsberg volcano.

Various layers of rock can be seen on the "Black Wall" near Nickenich. An information board provides information about the creation.

A cross-section of a cinder volcano reveals the entire spectrum of tephra, the totality of volcanic loose matter, ejected during the eruption. These include fine ash, small stones called "lapilli," bizarre cinder blocks, and thick chunks called "bombs." The color spectrum of the layered rocks ranges from red to brown to black, depending on the distance from the vent. Source: vulkanregion-laacher-see.de/a-schwarze-wand