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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.
Among them was a green epidotic rock which Agassiz had traced to this spot from the Bay of San Antonio on the Patagonian coast, without ever finding it in place. Some of the larger boulders had glacial furrows and scratches upon them, and all the hills bordering the shore were rounded and moutonnee.
The one exception is on Caribou Ridge, which is capped by a much altered gabbro. The first noticeable change in the character of the country rock is a Washkagama Lake, where a fine grained epidotic schist was observed, having a dip 82 degrees W. and a strike S. 78 degrees E. At Otter Lake a much foliated and weathered phyllite was found. Strike N. 73 degrees E. and a dip of 16 degrees.
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