Sunday, October 13, 2013

A Rocky Desert Outcrop

These rocks are formed of welded tuff, that is volcanic ash cemented together under tremendous heat and pressure. It erodes due to weaknesses in the rock that do not follow any particular pattern. On the side of the ridge, you can see ocotillo, saguaro and prickly pear cactus. This outcrop is located inside the Boyce Thompson Arboretum, just south of Superior, Arizona.

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