The deposits of the useful minerals & rocks; their origin, form, and content . and lead oreWhite, clayey, ore-bearing sandstone .... Red-brown shale and ore-bearing sandstone-slate . Lower Mhite ore-bearing sandstone ..... Red-brown and greenish shale ..... White, light red, and purple sandstone with nodules of cerussite andlayers of red-brown clay ...... 20 metres. 10 1-05-3 0-05-2 2 1-05 3 0-05 30 THE LEAD ORE-BEDS 1179 The thickness of the ore-bearing beds is very variable, frequentlyindeed they completely pinch out. The ore is chiefly cerussite, which inplaces, particularly in the main ore
The deposits of the useful minerals & rocks; their origin, form, and content . and lead oreWhite, clayey, ore-bearing sandstone .... Red-brown shale and ore-bearing sandstone-slate . Lower Mhite ore-bearing sandstone ..... Red-brown and greenish shale ..... White, light red, and purple sandstone with nodules of cerussite andlayers of red-brown clay ...... 20 metres. 10 1-05-3 0-05-2 2 1-05 3 0-05 30 THE LEAD ORE-BEDS 1179 The thickness of the ore-bearing beds is very variable, frequentlyindeed they completely pinch out. The ore is chiefly cerussite, which inplaces, particularly in the main ore-bed, is replaced by irregular patchesof galena. In depth the ore became poorer, and the previously successfuloperations had consequently to be suspended in the year 1891. With regard to genesis, it is significant that this deposit also is closelyconnected with a large fault, and in this case also the assumption of animpregnation zone is natural. Similar, though less important lead deposits are recorded nearPressath, particularly on the Eichelberg, north of Freihung. Dogger. Granite * , * Fig. 456. -Diagrammatic sectiou through the lead deposit at St. Sebastien dAigrefeiiille inFrance, at right angles to the strike. Glockemeier. The Lead Deposit at St. Sebastien dAigrefeuille, Department Gard, France LITERATURE Written communications from Dr. E. Naumann and Glockemeier to Krusch The lead deposit of Saint Sebastien dAigrefeuille in the DepartmentGard, occurs near the village of Generarques. The ore-bearing complexconsisting of conglomerate and sandstone, is some 10 m. thick and belongsto the Upper Triassic. As indicated in Fig. 456, the Triassic lies imme-diately upon granite, and in a complete section is overlaid by Lias andDogger. The ore-bed comes to the surface along an uplift, on either sideof which it remains covered bv Lias and Dogger. The section of this uplift, given in Fig. 457, shows under a surfacecovering a bed 1-5-3 m. thick consisting of sandstone and marly shale,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
