The Finne was created in the Triassic period (245 to 208 million years ago ) and was mainly composed of red sandstone, mussel bearing layers and the red and sandy clay of the Keuper, which is the uppermost Triassic level. The so-called “ Finne disruption “ is one of the most typical landscape features at the southern edge of the Finne. These disruptions came into being from raising mussel-bearing layers above the red sandstone as foothills of the alpine mountain formation, about 60 million years ago.

    The Unstrut and its tributaries eroded the soft layers of the Keuper and the massive, mussel-bearing layers completely breached the surface. A great number of cuts in this limestone were created by further erosion. These were the causes of the formation of the following heights in this area for example, the Finnberg, the Haslerberg, the Streitholz and others.

    Until today, a very interesting example of this ‘Finne disruption’ is to be found in the Lossa valley near Rastenberg, the so-called Mühl valley. Vertically stacked, red sandstone layers can be seen on the right Bank. Downriver, limestone, created from shells, is dominant on the left bank.

     A clay and sandy-brown coloured soil evolved by this weathering and became abundant here. These above mentioned elements are the basis for the abundance of species of the Finne.