Yellow-grey stones with dark spots - the Spotted marl (Allgäu layers). The sea floor of the Tethys Sea also had deeper basins that were filled with calcareous mud. Worms ate their way through the mud. The dark patches are their feeding tunnels. This is how the stones of the Allgäu layers, also known as spotted marl, were formed.

Lush alpine meadows, whole carpets of colourful alpine flowers and a magnificent sea of blossoms with an astonishing variety of species - the clayey, marly stones of the Allgäu strata form very fertile soils on which these treasures of the nature park thrive.