Report of progress 1874-1889, A-Z .. . t sedimentary strata. Such a fold, in the shape of aclosely-compressed synclinal trough, has been actuallyworked out at the Hurd mine in New Jersey, as representedin cross-section in the N. J. Geol. Report of 1868. I repro-duce this section in Fig. 13. The Hurd mine slope track is laid down on the bottomrock of the fold, and the breasts show that the ore risesvertically on one side of the fold, in a solid bed, to the sur-face. On the other side of the fold it also rises at a steepangle to the surface, but divided into several beds! A similar structure is
Report of progress 1874-1889, A-Z .. . t sedimentary strata. Such a fold, in the shape of aclosely-compressed synclinal trough, has been actuallyworked out at the Hurd mine in New Jersey, as representedin cross-section in the N. J. Geol. Report of 1868. I repro-duce this section in Fig. 13. The Hurd mine slope track is laid down on the bottomrock of the fold, and the breasts show that the ore risesvertically on one side of the fold, in a solid bed, to the sur-face. On the other side of the fold it also rises at a steepangle to the surface, but divided into several beds! A similar structure is said to exist in the Durham minesin Bucks county. No anticlinal or synclinal folds have yet been discoveredin the Berks county mines ; but if the gneiss rocks dip all *A chimney structure somewhat analogous to this characterizes the pre-cious ores of the West, and is explained ;by reference to the shifting of thewaved walls of fissures. Jecond^eol. Survey, 9a. ^SS3. ReportD.^. dlg. 13. 3Cv/rdtow7i i/ron Tnme in JfJe/r^&y. ^ 77im^duujl(Ua^am offaaltedracks^
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Keywords: ., bookcentury1, bookdecade1870, booksubjectcoal, booksubjectgeology
