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Updated: June 23, 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.
The trachyte-conglomerate which seems to be associated with the upper beds of the brown coal strata is traversed by dykes of trachyte of later date; and though it is difficult to trace the line between the two varieties of this rock on the ground, Dr. von Rath has recognised the general distinction between them, which consists in the greater abundance of hornblende and mica in the trachyte of the Wolkenburg than in that of the Drachenfels.
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