~ Mile 178: Vulcan's Anvil (or Vulcan's Forge) a large outcrop of basalt located near the middle of the Colorado river is thought to be a remnant of a volcanic neck (or plug or stock) of latest Tertiary to Quaternary age.
The URL is: https://gotbooks.miracosta.edu/gonp/grca/river/html/grca4024.htm
Last modified: 9/9/2010
