. Bulletin of the Geological Society of America. Geology. 100 C. H. CxORDON—SYENITE-GNEISS (lEOPARD ROCK) FROM CANADA. venieiice may be treated separately, though they belong to the same rock mass and grade into eacli other almost imperceptibly. They are— Coarse grained syenite-gneiss. Ellipsoidal syenite-gneiss (leopard rock). Streaked s^^enite-gneiss. Geological Occurrence of the Rock. The rock here described occurs in the form of dikes, sometimes cutting across the strike of the inclosing rocks and sometimes intercalated in them. In one form or another it is found at nearly all the apatite
. Bulletin of the Geological Society of America. Geology. 100 C. H. CxORDON—SYENITE-GNEISS (lEOPARD ROCK) FROM CANADA. venieiice may be treated separately, though they belong to the same rock mass and grade into eacli other almost imperceptibly. They are— Coarse grained syenite-gneiss. Ellipsoidal syenite-gneiss (leopard rock). Streaked s^^enite-gneiss. Geological Occurrence of the Rock. The rock here described occurs in the form of dikes, sometimes cutting across the strike of the inclosing rocks and sometimes intercalated in them. In one form or another it is found at nearly all the apatite open- ings examined. At the top of the hills at High Rock, about 20 rods southeast of the office, the exposed surface consists of a belt of pyroxenite inclosed in V V V V V ^ V V V V V,. '^)j V y y r'iGLRK 2 —Dike of coarse Sycnitr-ecneiss ciitlinc: Quarlzilc and Pyi oxenilc. A mass of the quartzite is inclosed in the syenite. The pyroxenite appears as a dike intercalated in the quartzite. quartzite, witli a strike of south 30° east (magnetic). At one point there is a slight linear depression covered with soil transverse to the strike of the rock, which evidently re[)resents a fault. On the south side of this depression the beds of quartzite and intercalated pyroxenite have been shifted about two feet to the east. On tlie north side both pyroxenite and quartzite are cut by a dike of coarse grained syenite in a direction south 20° east (magnetic). After passing the sui)posed fault-line the dike. 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 Geological Society of America. [New York : The Society]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
