This photograph is one of my favorites from Big Bend Vistas. Crown Mountain is an extinct volcano overlying a volcanic vent on the rim of the Pine Canyon Caldera.
The vent produced ash-flow tuff of the Pine Canyon Rhyolite followed by Boot Rock surge deposits, ash-flow tuffs and lavas and finally a lava dome. The dome is at the west end of the mountain and is not seen in this photograph in which spectacular Boot Rock pinnacles dominate the view. Light gray Chisos tuffs crop out in the foreground at bottom right.
Photographed from Mile 5 on the Rio Grande Village road.
