The deposits of the useful minerals & rocks; their origin, form, and content . r i 5 o&ppenreld. ? yf£?ra ifities ~~^ Lea^ and Zinc lodcj ^ Copper- Lodes \ the maps attached to the official descriptions. 795 796 OEE-DEPOSITS According to Denckmann, the limits to these groups are determinedby tectonic and stratigraphical factors. The Miisen-Silberberg group,for instance, occurs within an uphft of geologically recent date ; while astratigraphical dependence shows itself in the agreement in extensionbetween these groups and certain geological horizons. In this connectionalso, the fact that the fi
The deposits of the useful minerals & rocks; their origin, form, and content . r i 5 o&ppenreld. ? yf£?ra ifities ~~^ Lea^ and Zinc lodcj ^ Copper- Lodes \ the maps attached to the official descriptions. 795 796 OEE-DEPOSITS According to Denckmann, the limits to these groups are determinedby tectonic and stratigraphical factors. The Miisen-Silberberg group,for instance, occurs within an uphft of geologically recent date ; while astratigraphical dependence shows itself in the agreement in extensionbetween these groups and certain geological horizons. In this connectionalso, the fact that the fissures of these iron lodes coincide with theboundary fissures, branch veins, and cross-courses of subsidences presum-ably formed in upper Middle Devonian time, is of great significance,the determination of this fact having resulted from laborious research byDenckmann. A knowledge of the course of these subsidences becomestherefore of prime importance when prospecting for, or following suchsiderite lodes. Most of these lodes are steep, dipping from 60° to 90°, and they usuallycross the b
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
