The setting sun’s glow on the end point of Upper Siphon Draw trail, The Flatiron.

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The mountain was formed by a series of volcanic eruptions between 20.5 and 18 million years ago. The west face of the mountain is composed of dacite lava and rhyolitic tuff. The overlying tuff was deposited during an eruption which created a collapse caldera bounded by faults. Dome resurgence reactivated these faults, causing uplift of the caldera floor which juxtaposed the softer tuff and more resistant dacite. Differential weathering caused the outer tuff to erode faster, leaving the dacite cliffs exposed and creating the prominent mountain visible today.

The Flatiron, the mesa-like projection above us in this view, is long solidified dacite lava. The word dacite comes from Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains (now modern Romania and Moldova) where the rock was first described. Lost Dutchman State Park, Apache Junction, Maricopa County, Arizona

Reference: Wikipedia “Superstition Mountain” and “Dacite Lava.”

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