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Updated: October 24, 2026
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.