Geologically, the Hunsrück Natural Park consists of strata of Devonian rock (approximately 405-350 million years ago). At that time, vast areas of what is now Central Europe lay in a sea basin, the so-called geosycline sea, which was an extension to the north of the present-day Mediterranean. In the middle of this Devonian basin lay the so-called Middle European Island. Sediment deposited on the island's north coasts. In the subsequent geological periods, these loose sands underwent changes. Through an increase in pressure and temperature resulting from the ever thicker overlying formations of younger strata and tectonic events such as folding (in the Lower Carboniferous approximately 350-325 million years) and shifts within the rock deposits, the Taunus quartzite emerged, which is impressively manifested here on the "Mannfelsen".
In the Tertiary Period (approximately 60 million years ago) new elevations gave rise to the principal characteristics of our present-day landscape relief of mountains and valleys. During the geological epoch of the Quaternary (1.5 million years until today), so-called sub-glacial lakes or moraines developed during the Würm Ice Age on the elevated plains of the Hunsrück hills over 330m above sea level. Through erosion or weathering processes such as abrasion, rubbing due to frost or temperature weathering, sub-glacial terrain broke loose from the rock face and deposited on the lower slopes (after 200m to the left, you can see remains of such a moraine).
These stone deposits at the same time provided one of the main prerequisites for the building of such a vast fortification as the "Hunnenring", namely the construction material. It lay directly on the site, and only needed to be collected and as a result not specially mined in quarries.