About Ours-Pierre-Armand Petit-Dufrénoy
Ours-Pierre-Armand Petit-Dufrénoy (5 September 1792 – 20 March 1857) was a French geologist and mineralogist. == Education and career == He was born at Sevran, in the département of Seine-et-Oise. After leaving the Imperial Lyceum in 1811, he studied until 1813 at the École Polytechnique, and then entered the Corps des mines. He subsequently assisted in the management of the École des Mines, of which he was professor of mineralogy and afterwards director. He was also professor of geology at the École des Ponts et Chaussées. In conjunction with Élie de Beaumont in 1841 he published a great geological map of France, the result of investigations carried on during thirteen years (1823–1836). Five years (1836–1841) were spent in writing the text to accompany the map, the publication of the work with two quarto volumes of text extending from 1841 to 1848; a third volume was issued in 1873. The two authors had already together published Voyage Métallurgique en Angleterre (1827, 2nd ed. 1837–1839), Mémoires pour servir a une description géologique de la France, in four vols. (1830–1838), and a Mémoire on Cantal and Mont-Dore (1833).
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