The azoic rocks usually have a dip approaching the perpendicula, and a strike very nearly east and west. The upturned edges have been broken and worn by the ice of the glacial period; the harder layers affording material for the boulders so profusely scattered over the country to the south, while the softer layers have been disintegrated and removed to form valleys. These features are distinctly observed where the drift is not of sufficient depth, to obscure the.
It remains for the future investigations to study the interesting phenomena connected with these rocks, and to develope the useful products they contain.
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