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The contrasting morphology of rounded Hayrick Butte on the left and flat-topped Hoodoo Butte on the right, north of Mount Washington in the central Oregon Cascades, reflects dramatic differences in their origin. Hoodoo Butte is a tuya, a volcanic cone formed by eruptions that ponded in a cavity melted through a glacial icesheet. Hayrick Butte formed slightly later, when the Pleistocene icesheet had melted, and formed the classic rounded profile of a cinder cone.

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