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Updated: June 28, 2025
Above the gneiss and mica slate system, or group of strata, is the Clay Slate and Grawacke Slate System; that is to say, it is higher in the ORDER OF SUPRAPOSITION, though very often it rests immediately on the primitive granite. If we overlook the dubious statements respecting Sutherland and Bohemia, we have in this "system" the first appearances of life upon our planet.
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