. Annual report of the Regents. New York State Museum; Science. CRYSTALLINE ROCKS OF THE WESTERN ADIRONDACK REGION 471> different places, a fact which falls perfectly into line with the other structural data thus far Fig. 4 Contact of syenite and gneiss series. Length of section one half mile. A further and even more striking illustration-of the relation just brought out appears on the examination of exposures about one and one half miles east of the last locality where the road from Pitcairn forke to Jayville runs close to Jenny creek. Beside a waterfall and dam in the creek
. Annual report of the Regents. New York State Museum; Science. CRYSTALLINE ROCKS OF THE WESTERN ADIRONDACK REGION 471> different places, a fact which falls perfectly into line with the other structural data thus far Fig. 4 Contact of syenite and gneiss series. Length of section one half mile. A further and even more striking illustration-of the relation just brought out appears on the examination of exposures about one and one half miles east of the last locality where the road from Pitcairn forke to Jayville runs close to Jenny creek. Beside a waterfall and dam in the creek there is an excellent exposure of the syenite in contact with a fine, well laminated, dark gray gneiss. The contact is very sharp and there is no gradation between the two rocks though the syenite is as usual gneissoid with foliation parallel to that of the fine gneiss. The syenite forms lenses elongated in the direction of foliation and also irregular masses cutting across the foliation of the gneiss. The width of the lenses varies greatly as does that of the gneiss between adjacent lenses and sharp inclusions of the gneiss occur in the syenite. The phenomena are all exhibited with great clear- ness in a section parallel to the strike, and after a most careful Fig. 5 Contact of syenite and fine gray gneiss presumably of the limestone series. The section is parallel with the strike and is about 25 feet in length. examination the writer found it impossible to arrive at any satis- factory explanation other than that of the intrusion of the sye- nite into the gneiss. Fig. 5 is taken from a field diagram of this. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum; University of the State of New York. Board of Regents. Albany : J. B. Lyon, State Printer
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Keywords: ., bookauthorne, bookcentury1800, bookdecade1880, booksubjectscience
