Discordant, or cross-cutting, tabular intrusion. Most dykes are vertical or near vertical, having pushed their way through the overlying country rock. See alsodyke set; dyke swarm; radial dyke.
Geography
A discordant vertical or semi-vertical wall-like igneous intrusion; see McDonnell et al. (2004) Mineralogical Mag. 68, 5 on the Slieve Gullion ring dyke, Ireland.