Vulcan’s Forge (or Vulcan’s Anvil) is a volcanic neck below Toroweap Point. It is part of an igneous dike and sill system of probable Pleistocene age in this part of Grand Canyon. (Photo by Steve Rauzi)
Online resources:
Interactive Geologic Map of Grand Canyon and Vicinity. Geology by G. Billingsley and other USGS staffers. Compiled digitally by Ryan Clark. http://rclark.github.io/grand-canyon-geology/
