geo.wikisort.org - Mountains
The Rodderberg is an extinct volcano in the east of the municipality of Wachtberg near Bonn, Germany. The last eruption was 250,000 years ago.
 | This article does not cite any sources. (December 2007) |
It is situated just above the Rhine Valley. Together with the Drachenfels directly opposite, the Rodderberg narrows the Rhine Valley. This gorge portion is the southern limit of the lowland-bay of Cologne.
The Rodderberg offers views to the Siebengebirge, the Rhine Valley and up to the Cologne Cathedral, about 50 km away.
Geology
The Rodderberg detonated in a phreatomagmatic eruption about 250,000 years ago. This happened when the magmatic plume reached the groundwater level of the Rhine (about 50m higher than today). After the explosion, the crater was filled with water that formed a maar of about 90 m depth. In the last 250,000 years this feature filled with dust and soil until it was filled up to today's level.
At present, all that is left of the old volcano is just a small hill that has a shallow concave shape. If one didn't know that it was a volcano, one would not recognize it.
На других языках
[de] Rodderberg
Der Rodderberg ist ein 196,7 m ü. NHN[1] hoher, erloschener Vulkan im Osten der Gemeinde Wachtberg und im Norden der Stadt Remagen (Ortsbezirk Rolandswerth) nahe dem Bonner Ortsteil Mehlem. Das Gestein hat ein Alter von ca. 800.000 Jahren, die letzte Eruption wird auf 250–300.000 Jahre datiert. Der über 50 Meter tiefe kreisrunde Sprengtrichter mit einem Durchmesser von ca. 800 Metern ist noch heute als Bodensenke sichtbar. In einer ehemaligen Tuffgrube kann man einen Gang aus dem basaltähnlichen Leucit-Nephelinit betrachten.- [en] Rodderberg
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