. Annual report. New York State Museum; Science; Science. y8 NEW YORK STATE MUSEUM where the highway crosses it by a ford in a northeasterly direction and in the extreme northeast corner of the Elizabethtown quad- rangle. This is illustrated in figure 13. The country rock is anorthosite which has been cut bv an east and west gabbro dike, 27 feet wide. Still later but before the faulting a narrow black trap dike penetrated both rocks with a northeast strike. The com- plex was then dislocated by two faults of which the westerly one moved the two dikes to the south about the width of the gabbro,
. Annual report. New York State Museum; Science; Science. y8 NEW YORK STATE MUSEUM where the highway crosses it by a ford in a northeasterly direction and in the extreme northeast corner of the Elizabethtown quad- rangle. This is illustrated in figure 13. The country rock is anorthosite which has been cut bv an east and west gabbro dike, 27 feet wide. Still later but before the faulting a narrow black trap dike penetrated both rocks with a northeast strike. The com- plex was then dislocated by two faults of which the westerly one moved the two dikes to the south about the width of the gabbro, and the more easterly moved the eastern prolongation about 10 feet back to the north. The figure gives the actual exposures, and where no rock symbol appears they are beneath the stream gravels. The trap dike appeared to terminate against the western bank, but no appreciable faulting was evident. Figure 14 illustrates all that can be seen of a horizontal band of black hornblendic rock in the white Grenville marble, a hundred yards north of Cheever dock. This is believed to be a dike or narrow sheet, which, 6 feet in width, penetrated the limestone. It has been so broken that only three blocks remain visible and two of these are separated by 60 feet of an interval. The limestone has molded itself into the interval, obviously while plastic under pres- sure, illustrating those flowage phenomena which led Professor Ebenezer Emmons to consider the limestone an igneous 10 uoft, Zl— 1 Fig. 14 Faulted block? of black hornblende schist, presumably intrusive and now in Gren ville limestone, just north of Cheever dock, Port Henry . Much the same thing is shown in plate 11 from a photograph in the limestone quarry south of the Pilfershire mines and just east of Barton brook. A sheet similar to the last has been broken into three pieces, of which the middle one has been pushed upward by the viscous limestone. In the mines we find the best cases of faulting and the ones most clearl
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
