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Updated: May 21, 2025
The quartz grains show secondary growth. 13 Altered Gabbro Thirty-two Miles Above Wuchusk Nipi on Nascaupee River. A coarse dark green rock whose principal constituents are pyroxene plagioclase and magnetite. There is a slightly developed diabasic structure and the rock is much altered by weathering; the resultant product being chlorite. 14 Quartizite Bibiquagin Lake.
David's, consisting of diabasic and felsitic lava, with beds of ash; and in the centre of England, amongst the grits and slates of Charnwood Forest presumably of Cambrian age, various felstones, porphyries, and volcanic breccias are found.
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