This easy, one-mile forested trail follows the rim of Pinnacle Valley, offering stunning views of these fairytale towers.
The gray and brown pinnacles were formed when pumice and ash filled the valley following Mazama’s big eruption. Hot gasses trapped underneath this layer of volcanic material escaped through cylindrical vents called fumaroles.The intense heat and chemical action of the gasses caused the pumice and ash surrounding these volcanic vents to harden. Later, when streams of water once again cut through the valley, the softer rock material eroded away, leaving behind these fantastic “fossil fumaroles.”
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