. Bulletin of the Department of Geology of the University of California. Lawson.] Ma lignite. 339 The shores of the lake are occupied for the most part by a coarse syenite-like rock which is intrusive in the mica schists of the Coutchiching series of the Ontarian system of the Archaean. This intrusive mass has a roughly elliptical shape in ground plan, with a longer diameter of not less than six miles, and a shorter diameter of about three miles. It has the same intrusive relation to the Goutchiching schists as do the normal Laurentian biotite granites and hornblende granites and their gneissi
. Bulletin of the Department of Geology of the University of California. Lawson.] Ma lignite. 339 The shores of the lake are occupied for the most part by a coarse syenite-like rock which is intrusive in the mica schists of the Coutchiching series of the Ontarian system of the Archaean. This intrusive mass has a roughly elliptical shape in ground plan, with a longer diameter of not less than six miles, and a shorter diameter of about three miles. It has the same intrusive relation to the Goutchiching schists as do the normal Laurentian biotite granites and hornblende granites and their gneissic modifications. The mica schists strike around the mass so as to inclose it on all sides. Figure i.—Sketch map of Poohbah Lake; showing relation of the laccolite mass to the Coutchiching schists. A. nepheline-pyroxere- malignite; B, panidiomorphic-gneissic-fades of the same; C. garnet-pyroxene-malignite; D, a minor facies of the same; E. amphibole-malignite; F, Coutchiching schists. The numbers 495> 5OI> 5°3> 5°6) and 510 indicate where specimens were taken. Scale, two miles=one inch. The schists are well exposed on the north side of the lake and at its southwest extremity; and the known distribution of the same rocks in the region to the north, west, and south of the lake is ample war- rant for the approximate delimitation of the intrusive mass indi- cated on the accompanying diagram, Fig. r. To the northwest of the. 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 University of California, Berkeley. Dept. of Geology. Berkeley : The University
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