Reference work entry

claystone, clay-stone, clay rock, tonstein [German] [A compact argillaceous rock containing the clay mineral kaolinite in a variety of forms together with occasional detrital and carbonaceous material, commonly occurring as a thin band in a Carboniferous coal seam (or locally in the roof of a seam), and often used as an aid in correlating European strata of Westphalian age.] [German] Tonstein m

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