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Updated: May 6, 2025
The rock has probably been derived by dynamic metamorphism, from a coarse igneous rock like a gabbro. 7 Epidotic Sericitic Schist. Washkagama Lake. A fine grained compact gray rock, of aggregate structure, consisting chiefly of quartz, plagioclase and biotite, and the alteration products epidote and sericite.
The lowest bed of a calcarous sericitic schist is four feet thick and underlies a bed of schistose lime stone six feet in thickness, which is in turn covered by a finely laminated phyllite, ten feet thick. The whole is capped by thirty feet of quartzite, which forms the top of a long ridge.
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