An apparently deeply weathered soil profile on well foliated amphibolite is described from the Gould Lake area, Ontario, although such residual soils developed on country rock have not been previously recorded. The evidence from a variety of analyses indicates that this deep soil profile, typical of a very limited area, has been developed on a saprolite-like, probably hydrothermally altered, rock material. Similar crumbly rock material preserving rock structures has been reported from several areas in the Canadian Shield.

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