The deposits of the useful minerals & rocks; their origin, form, and content . r.—Einecke. Die siidwestliche Fortsetzung des Holzappeller Gangzugeszwischen der Lahn und der Mosel, Bericht der Senkenbergischen naturforschendenGesellschaft, 1906.—Holzapfel. Das Rheintal von Bingerbriick bis Lahnstein, k. pr. geol. Landesanst., New Series, XV., 1893.— of the Mining DistrictsWiesbaden-Dietz, 1893, bj- Holzapfel, Uleich, Korfer, etc., pubUshed by the RoyalMining Department at Bonn.—W. Schoppe. Der Holzappeler Gangzug, Kgl. Landesanst., Arch. f. Lagerstattenforsc
The deposits of the useful minerals & rocks; their origin, form, and content . r.—Einecke. Die siidwestliche Fortsetzung des Holzappeller Gangzugeszwischen der Lahn und der Mosel, Bericht der Senkenbergischen naturforschendenGesellschaft, 1906.—Holzapfel. Das Rheintal von Bingerbriick bis Lahnstein, k. pr. geol. Landesanst., New Series, XV., 1893.— of the Mining DistrictsWiesbaden-Dietz, 1893, bj- Holzapfel, Uleich, Korfer, etc., pubUshed by the RoyalMining Department at Bonn.—W. Schoppe. Der Holzappeler Gangzug, Kgl. Landesanst., Arch. f. Lagerstattenforschimg, Part III., Berlin 1911. The country of the Lower Lahn consists chiefly of Lower Devonian,which to the east is overlaid by Middle and Upper Devonian. The beds THE LEAD-SILVEE-ZINC LODES 697 strike north-east and occur in many parallel folds, which being over-turned the beds almost invariably dip south-east. In relation to thelodes, only the Lower Devonian beds come into question, namely, theHunsriick slate as lowermost bed, and then the Lower and Upper Coblenz,. Fig. —Geological map of the Holzappel lode-system. Scale. 1 : 50,000. these consisting of various clay-slates, grauwackes, and quartzites, withporphyroid slates and diabase. In consequence of the numerous faultsand the rarity of horizons with characteristic fossils, the correct correla-tion of any particular bed is not easily determined. The porphyroid slatesbelong to the deepest horizon of the Lower Coblenz ; these rocks aregenerally regarded as dynamically metamorphosed eruptives and tuffs. 698 OEE-DEPOSITS The rock known as white rock deserves special notice. Thisformerly Avas regarded either as a bedded occurrence, in which case itwould represent an altered slate or porphvroid, or as a dyke, when itwould represent a decomposed diabase. Schoppe endorses the viewexpressed by Rosenbusch that this white rock has resulted chiefly fromthermal metamorphism, and only recognizes as white rock that which o
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