Tucson Mountains
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Geologically, the mountains are remnants of old volcanoes, consisting of "rhyolite, ash deposits (tuff) and brechia".
The picture was taken at sunset, with the last of the day's light adding a hint of red to the mountain's otherwise brown, sandy soil.
Faint signs of the saguaro cacti dotting the mountain are present.
© 2008 Patricia A. Michaels