Burgstein (Dollnstein)
The steeply towering Burgstein is part of a rock massif in the Upper Bavarian district of Eichstätt on the northern edge of the Upper Altmühltal near Dollnstein opposite the Bubenrother mill in the Altmühltal Nature Park .
Emergence
At the time of the “White Jura” (= Malm ), southern Germany was covered by a shallow subtropical shelf sea. In this shallow sea, shallow platforms with coarse-grained calcium deposits and deep troughs with fine-grained calcium deposits alternated . The approx. 45 meter high castle stone consists essentially of the massive platform limestone deposits with a few sponge reefs that grew on the slopes of the platforms. While the limestone layers of the tubs were heavily compacted over time by overlying rock layers, the reef and platform limestone withstood the pressure of the mountains and was preserved as panels and thicker blocks. The erosion prepared these harder areas preferentially. In particular at the impact slopes of the rivers - in this case the glacial ancient Danube - this led to rock waivers.
Chronological order
The limestones of the Malm were formed around 135 to 154 million years ago. About 5 million years ago, the primordial Danube began to cut and use it to carve out the rocks. This work was, so to speak, finished when the original Danube shifted its course further south to today's Schuttertal and finally to the edge of the Alb in its current bed during the Riss Cold Age around 150,000 years ago .
Geotope
The Burgstein has been designated by the Bavarian State Office for the Environment (LfU) as a geoscientifically valuable geotope (geotope number: 176R006). It was also awarded the official seal of approval for Bavaria's most beautiful geotopes by the LfU .
natural reserve
The Burgstein lies on the southern edge of the 62 hectare dry slopes nature reserve near Dollnstein . In addition to the dominant dolomite rocks, semi-arid grasslands can be found here as former sheep pastures with juniper vegetation , dry grasslands on rocky areas, hedges, bush islands and on the edge of deciduous and mixed forests - a succession of different plant communities in natural succession and partly with botanical rarities. There is flourishing life on the rock heads themselves, too. B. White stonecrop , which is used by the rare Apollo butterfly as a forage plant. The ecological value of this nature reserve results from this richness of different biotope types. The rock is a nationally popular and not always harmless destination for climbers (danger of falling rocks). The difficulty levels of the climbing routes range from III to IX with a numerical focus (26 routes) from VI to VIII.
literature
- Mühlbergleite near Dollnstein. In: Karl Zecherle and Toni Murböck: Nature worth seeing in the Eichstätt district, Eichstätt 1982, p. 18f.
- Notice board of the Bavarian State Ministry for State Development and Environmental Issues in front of the Burgstein
Individual evidence
- ^ Bavarian State Office for the Environment, Geotop Burgstein E von Dollnstein (accessed on October 24, 2017).
- ↑ Bavaria's most beautiful geotopes, Burgstein near Dollnstein (accessed on October 23, 2017)
Web links
Coordinates: 48 ° 52 ′ 6 " N , 11 ° 5 ′ 43" E