Les dépôts de minéraux utiles et les rochers ; leur origine, la forme et le contenu . le verset en défauts sections déplacées mutuellement. Étant donné que ces fissures dans placescut et allongée par des nodules individuels, il est évident que, inpart en tout état de cause, ils sont plus jeunes que les nodules, ou que leur movementalong est repris à une date ultérieure. À partir de ce la trop goingconclusion a été tiré que la formation de nodules le owesnothing à la présence de l'anomalie. La minéralisation concernant il y a en général deux visites, à savoir respectivement les,de formation et épigénétiques syngénétique. Le B

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The deposits of the useful minerals & rocks; their origin, form, and content . verse faults into mutually displaced sections. Since these fissures in placescut through and elongate individual nodules, it is evident either that, inpart at all events, they are younger than the nodules, or that movementalong them recurred at some later date. From this the too far-goingconclusion has been drawn that the formation of the nodules owesnothing to the presence of the faults. Concerning mineralization there are in general two views, namely, those respectively of syngenetic and epigenetic formation. The Bunteron the north border of the Eifel represents imdoubtedly a littoral formation, proof of this existing in the sudden change of sandstone beds into beds ofconglomerate, and vice versa. The possibility must therefore be consideredthat plumbiferous mineral springs emerged through the sea floor andsaturated the accumulating sands, depositing their lead content in theform of sulphide, in suitable places and around certain centres. Against South-west opencut Xorth-east opencut. Fissures filled with soft clay and sand. Fig. 455. -Diagrammatic section through the opeucuts on the Gviesberg near Coniraern, belonging to the Gottessegeu Company. Blanckeuhorn. this view of a syngenetic formation however, the sudden change in thedistribution of the ore nodules, as ^ell as the occurrence of mineral drusesin the conglomerate, must be set. Haber and Po§epny have pointed out that though the nodules generallyspeaking lie parallel to the bedding, they also frequently form zones alongboth sides of the steeply inclined fissures; that is to say, they are likewisearranged transversely to the bedding. In many cases a relation betweenthe nodules and narrow lead veins exists, in so far that the latter are con-tinued as nodular zones. It is also a noteworthy fact that argillaceousconcretions are free from lead. In addition, not far from Commern, normallead lodes of considerable width occur in the Bunte

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