The clay-slate or gray-wacke, as it is shattered by frost, and carried down by torrents, of course forms itself into irregular flattish masses. [Please select]
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A beautiful bust of gray-wacke in our possession probably represents the same king. [Please select]
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The Cumberland and Westmoreland hills are, in general, composed of clay-slate and gray-wacke, with occasional masses of chert[7] (like that which forms the summit of Scawfell), porphyritic greenstone, and syenite. [Please select]
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