a. Geol. [ad. L. vergent-, vergens, pr. pple. of vergĕre to VERGE.] Constituting, or belonging to, a series of Appalachian strata corresponding in age to the middle Devonian strata of British geologists.
1858. H. D. Rogers, Geol. Pennsylv., I. 108. Vergent Flags (Portage Flags of New York). Ibid. Vergent Shales (Chemung Group of New York). Ibid., II. 732. The Cadent and Vergent rocks contain important bands of iron ore.
