Adam Sedgwick, an English geologist, born at Dent, Yorkshire, about 1785, died in Cambridge, Jan. 27, 1873. He graduated at Trinity college, Cambridge, in 1808, became a fellow of the college, and in 1818 succeeded Hailstone as professor of geology. He was elected a fellow of the royal society in 1819, and from 1829 to 1831 was president of the geological society. In 1827 he made a geological tour of Scotland, and in 1829, in conjunction with Murchison, visited different portions of Germany, Austria, and Switzerland, especially studying the Alps. In 1831 he commenced a critical survey of the lower palaeozoic strata of England and Wales. He first applied the term Cambrian to a series of rocks intermediate between the Silurian of Murchison and the subjacent crystalline schists and granites; and a bitter controversy arose between the two geologists respecting the use of the terms Cambrian and Silurian. (See Geology, and Murchison.) In 1834 Prof. Sedgwick became prebendary of Norwich. Besides numerous contributions to the transactions of societies, he published "Discourse on the Studies of the University of Cambridge" (1850), and "A Synopsis of the Classification of the Palaeozoic Rocks" (1855). He was a strenuous opponent of the theory of evolution, and attacked Darwin's "Origin of Species." For detailed accounts of his researches, see "Memoirs of Sir Roderick I. Murchison," by Archibald Geikie (2 vols., London, 1874), and "Chemical and Geological Essays," by T. Sterry Hunt (Boston, 1875).