A series of Sandy and argillaceous, and often calcareous strata, the prevailing colour of which is brick red, but having portions greenish gray, which occur often in spots and stripes, so that the series is sometimes called variegated sand stone. In Europe

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[Source: "Glossary of Miners'&Mineral Terms" in St. John, John R. A True Description of the Lake Superior Country ... (New York, W. H. Graham, 1846).]