This is a volcano which sputtered, spewed, and vented lava repeatedly, then blew its west side away! When its source magma contained gas, it erupted violently spewing frothy lava high into the air. During its last activity, probably over 50,000 years ago, one eruption blew out an enormous part of its side.
Today you can walk into the center of this now forested blowout crater, then follow the least steep path feet to the top covering 500 vertical feet. The view is grand in all directions. There are no formal trails and the ascent is slippery even when dry... and very steep.
The view from the summit is mighty. Mount Taylor to the north, El Morro to the northwest, The Narrows to the East, and the Sawtooth Range to the south. Truly, you will see volcanoes most everywhere you look.