The Geology of Chester County: After the Surveys of Henry D. Rogers, Persifor Frazer, and Charles E. Hall

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J. Peter Lesley
Board of Commissioners, 1883 - 399 Seiten
 

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Seite i - Board of Commissioners of Geological Survey, In the office of the Librarian of Congress, at WASHINGTON, DC Electrotyped and printed by LANE S.
Seite 197 - It would seem to be a pretty general fact, that such of these veins as are confined entirely or chiefly to the gneiss bear lead as their principal metal, whereas those which are included solely within the red shale are characterized by containing the ores of copper. But the zinc ores, viz: zinc-blende and calamine, prevail in greater or less proportions in both set of veins, existing, perhaps, in a rather larger relative amount in the copper-bearing lodes of the red shale.
Seite 30 - Colonies in America, and to prevent the Erection of any Mill or other Engine for slitting or rolling of Iron, or any plating Forge to work with a Tilt Hammer, or any Furnace for making Steel in any of the said Colonies...
Seite 197 - ... its average width at not less than eighteen inches. It is bounded by regular and well-defined, nearly parallel walls, the prevailing material of which is a coarse, soft granite, composed chiefly of white feldspar and quartz. " It would seem to be a pretty general fact that such of these veins as are confined entirely or...

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