nonnenstrom

Updated: May 25, 2025

The range consists mainly of trachytic rocks namely, trachyte-conglomerate, and solid trachyte, of which H. von Dechen makes two varieties that of the Drachenfels, and that of the Wolkenburg. But associated with these highly-silicated varieties of lava and generally, if not always, of later date are basaltic rocks which cap the hills of Petersberg, Nonnenstrom, Gr. and Ll. Oelberg, Gr.

Edward Hull - Volcanoes: Past and Present