a. Geol. [f. Uriconi-um, name of Roman town at Wroxeter, + -AN.] Consisting of, pertaining to, a series of volcanic rocks such as constitute the Wrekin in Shropshire.
1886. C. Callaway in Q. Jrnl. Geol. Soc., XLII. 481. In the Uriconian series itself I had found conglomerates full of rounded pieces of granitoid and gneissic rocks. Ibid., 483. The Charlton conglomerates are of Uriconian age.
1893. Geikie, Text-bk. Geol. (ed. 3), 710. The Uriconian volcanic group … is probably pre-Cambrian.
