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Such carbonic acid, meeting with the protoxide of iron in solution, would unite with it and form a carbonate of iron; and this mingling with fine mud, when the excess of carbonic acid was removed, might form beds or nodules of argillaceous ironstone. Natural size and magnified. b. Natural size and magnified. Goniatites Listeri, Martin. Aviculopecten papyraceus, Goldf.
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