Rodderberg

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Rodderberg
View from the Drachenfels to the Rodderberg

View from the Drachenfels to the Rodderberg

height 196.7  m above sea level NHN
location Rhineland-Palatinate / North Rhine-Westphalia
Mountains Rhenish Slate Mountains
Coordinates 50 ° 38 '29 "  N , 7 ° 11' 49"  E Coordinates: 50 ° 38 '29 "  N , 7 ° 11' 49"  E
Rodderberg (North Rhine-Westphalia)
Rodderberg
Type Extinct volcano
rock u. a. Leucite-Nephelinite
Age of the rock 800,000 years
particularities Nature reserve
Rodderberg from the northwest. In the background the Rhine and Bad Honnef.
Views from the Rodderberg
of the Siebengebirge (1960)
on Bonn
north into the Rhine Valley

The Rodderberg is 196.7  m above sea level. NHN high, extinct volcano in the east of the municipality of Wachtberg and in the north of the city of Remagen (district Rolandswerth ) near the Bonn district of Mehlem . The rock is around 800,000 years old; the last eruption is dated 250-300,000 years ago. The more than 50 meters deep, circular explosive funnel with a diameter of approx. 800 meters is still visible today as a depression. In a former tuff pit you can see a corridor made of the basalt-like leucite-nephelinite .

Location and surroundings

The Rodderberg is located directly above the northern exit of the Middle Rhine Valley . Together with the Drachenfels, which is almost directly opposite, it narrows the Rhine Valley. This bottleneck forms the southern border of the Cologne Bay , while south of this bottleneck is the small valley widening of Oberwinter (left bank of the Rhine) and Bad Honnef and Rheinbreitbach (right bank of the Rhine). On the slope of the Rodderberg towards the Rhine stands the Rolandsbogen , a romantically situated ruins of the former hilltop castle Rolandseck . Below the Rodderberg there are two islands in the Rhine: Nonnenwerth and Grafenwerth .

The mountain can be reached via Bonn- Mehlem . On the way there is the Heinrichsblick , one of the best and most famous viewpoints of the Siebengebirge .

Nature reserve

The Rodderberg was declared a nature reserve in 1927 . This area includes the North Rhine-Westphalian part of the Rodderberg east of the village of Niederbachem in the municipality of Wachtberg in the Rhein-Sieg district and south of the district of Mehlem in the federal city of Bonn .

The southeastern part of the Rodderberg in the Rolandswerth district of the city of Remagen belongs to Rhineland-Palatinate and is also designated as a nature reserve there.

See also: List of nature reserves in the Ahrweiler district

geology

For thousands of years, sediments and dust were deposited in the drainless crater and filled it up.

In the past few decades, drilling and geoscientific investigations have been carried out repeatedly. The earliest known drilling took place in 1833 and was 19 meters deep. It was a well excavation for the Broichhof there. In 2011, the Leibniz Institute for Applied Geophysics (LIAG) began a new series of drilling in the crater center . The three exploration wells reached depths of 74, 102 and 164.4 meters.

The drill profile initially shows a 70 meter thick fill of loess , loess derivatives and organic lake deposits, followed by 45 meters of volcanic ash and slag. Solid basalt has been identified from a depth of 115 meters to the final depth of 164.4 meters . Work on the drilling site was completed in March 2012.

Broichhof and equestrian sports

In the crater lies the Broichhof, which was formerly a moated castle in the marshy crater floor at that time. The former two-part moated castle was abandoned in the Middle Ages, but rebuilt in 1635 by the St. Gereon Abbey in Cologne. The manor house from the first half of the 19th century was built from Rodderberg lava. Since 1811 the Broichhof has been owned by the Schaefer family, who mainly ran agriculture there.

In 1965, Dirk Schneider leased the riding facility and founded the Rodderberg riding school. The riding and hunting club Rodderberg e. V. promotes eventing in particular . The riding school has been the regional base of the Rhenish eventing equestrianism since 1985, and the club has been organizing larger tournaments on a regular basis since then. In 1998 the Rodderberg-Park-Turniersport GmbH was founded to host national and international tournaments to support the club as an organizer. In 2001 the first CCIO *** took place in Germany in Rodderberg Park .

literature

  • Bruno P. Kremer, district of Ahrweiler (ed.): The Rodderberg. Geo- and biotope on the volcanic northeast corner of the Ahrweiler district . In: Heimat-Jahrbuch Kreis Ahrweiler 2008 , Weiss-Druck, Monschau 2007, ISSN  0342-5827 , pp. 103-109. [not yet evaluated for this article]
  • Henrik Blanchard: New findings on the eruption and landscape history of the Rodderberg near Bonn. Diploma thesis at the Geographical Institute of the Rheinische Friedrich-Wilhelms-Universität Bonn, September 2002. ( PDF ).
  • Wilhelm Meyer, Johannes Stets: The Rhine Valley between Bingen and Bonn. Borntraeger brothers, Berlin / Stuttgart 1996, ISBN 3-443-15069-1 . (Collection of Geological Guides, Volume 89)
  • Hans-Ulrich Schmincke: Vulcanism. 2nd Edition. Scientific Book Society, Darmstadt 2000, ISBN 3-534-14102-4 .
  • Geological State Office North Rhine-Westphalia (ed.), Gangolf Knapp, Klaus Vieten: Geological map of North Rhine-Westphalia 1: 25,000. Explanations for sheet 5309 Königswinter . 3rd, revised edition, Krefeld 1995, p. 44.

Web links

Commons : Rodderberg  - Collection of Images

Individual evidence

  1. ↑ a b Information according to digital topographic map 1: 5,000 (DTK5)
  2. ^ Heinrichsblick in the Rhineland Nature Park
  3. ↑ The Internet presence of the latest research project Rodderberg on the LIAG website ( Memento of the original from January 31, 2012 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.liag-hannover.de
  4. ↑ Rodderberg Riding School. Retrieved November 21, 2012 .
  5. ^ Rodderberg Park Turniersport GmbH. Retrieved November 21, 2012 .