CREDNER

credner, carl friedrich heinrich (1809-1876), german geologist, was born at waltershausen near gotha, on the 13th of march 1809. he investigated the geology of the thuringer waldes, of which he published a map in 1846. he was author of a work entitled _uber die gliederung der oberen juraformation und der wealden-bildung im nordwestlichen deutschland_ (prague, 1863), also of a geological map of hanover (1865). he died at halle on the 28th of september 1876. his son, carl hermann credner (1841- ), was born at gotha on the 1st of october 1841, educated at breslau and gottingen, and took the degree of ph.d. at breslau in 1864. in 1870 he was appointed professor of geology in the university of leipzig, and in 1872 director of the geological survey of saxony. he is author of numerous publications on the geology of saxony, and of an important work, _elemente der geologie_ (2 vols., 1872; 7th ed., 1891), regarded as the standard manual in germany. he has also written memoirs on saurians and labyrinthodonts.