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Updated: May 22, 2025
Beyond, rose the summits of the Siebengebirg. Solemn and dark, like a monk, stood the Drachenfels, in his hood of mist, and rearward extended the Curtain of Mountains, back to the Wolkenburg, the Castle of the Clouds. But Flemming thought not of the scene before him. Sorrow unspeakable was upon his spirit in that lonely hour; and, hiding his face in his hands, he exclaimed aloud;
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.
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.
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