CREDNER, CARL HERMANN German geologist, born at Gotha on Oct. 1, 1841, son of the geologist, C. F. H. Credner (1809-1876), was educated at Breslau and Gottingen. In 1870 he was appointed professor of geology in the University of Leipzig, and in 1872 director of the geological survey of Sax ony. He wrote an important work, Elemente der Geologie (1872; ed. 1912), long regarded as the standard manual in Ger many. He also wrote memoirs on saurians and labyrinthodonts, and works on the geology of Saxony. He died at Leipzig on July 22, 1913.