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Iddings, Joseph Paxton

geologist, author, was born Jan. 21, 1857, in Baltimore, Md. In 1880 he was appointed assistant geologist on the United States geological survey. His scientific papers, published in the American Journal of Science, and the Bulletin of the United States geological survey, include Notes on the Volcanoes of Northern California, Oregon, and Washington Territory, with Arnold Hague; The Columnar Structure in the Igneous Rock on Orange Mountain, New Jersey; and The Nature and Origin of Lithophysæ and the Lamination of Acid Lavas.