Tönchesberg
The Tönchesberg is an extinct volcano about 2.5 kilometers southeast of Kruft in the Vulkaneifel . It is a cinder cone that is almost completely dismantled today.
The Tönchesberg is part of a group of cinder cone complexes to which the neighboring tub heads and the Eppelsberg also belong. It erupted for the last time about 160,000-165,000 years ago during the penultimate ice age ( Saale glacial period ) in the Pleistocene . By geomagnetic investigations least nine different could eruption centers suspected as the supplier of Tönchesbergsedimente.
A characteristic feature of the Tönchesberg are missing lava flows as well as disparate slags, which geochemically have a basanitic to tephritic character. The hematite slags are rich in adjacent rock material. The adjacent rock was also brought up and is composed of fritted quartzites and Devonian clay schist . The slag is also rich in secondary components such as hornblende , basaltic augite , feldspar and mica ( phlogopite ).
literature
- U. Becker, Wolfgang Boenigk, B. Hentzsch: Reverse magnetization in the early worm-period outer layers on the Tönchesberg / Eastern Eifel. Mainz natural science. Archive 27: 1-22, 1989.
- NJ Conard: Tönchesberg and its Position in the Paleolithic of Northern Europe. - RGZM 20 monographs; Bonn 1992.
- Josef Frechen: Siebengebirge on the Rhine, Laacher volcanic area, maar area of the West Eifel . Geological Guide Collection, Vol. 56, 1976.
Coordinates: 50 ° 22 ′ 4 ″ N , 7 ° 21 ′ 41 ″ E