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Eagle Crags – Prominent Geological Features of Crater Lake National Park

Much of the beauty of the walls of Crater Lake comes from the delicate coloring of the rocks, notably on Garfield Peak and the Eagle Crags and beneath Hillman Peak, where they have been affected by solfataric action. Here the normally somber colors of the andesites give way to shades of yellow, buff, brown, and orange which contrast pleasingly with the deep blue of the adjacent lake and the bright reds of the slaggy lava crusts. [The Main Andesite Cone of Mount Mazama: Solfataric Areas and Vents, The Geology of Crater Lake National Park, Oregon (1942) by Howell Williams]

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