Chisos Basin

by bill macleod on September 19, 2009

Chisos Mountains Lodge and Casa Grande (7,325 feet) in the early morning mist. Casa Grande is a square-topped monolith of bare volcanic rock with sheer, towering cliffs overlooking the Lodge some 2,000 feet below. The volcanic rhyolite dome capping the mountain is slow to erode, and forms solid cliffs. Below it, thinly layered surge deposits and air-fall tuffs erode more easily and form gentler slopes.

Each of the volcanic domes on Casa Grande, Toll Mountain and Emory Peak lies above a volcanic vent and so each can considered an extinct volcano.

The photograph was taken from the Window View Trail in July 2008 at 7:30 a.m.

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