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Geology and History

Geology and history of Mount Bachelor.

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Geology and History Summary for Mount Bachelor

Mount Bachelor is a basalt to basaltic andesite summit cone that sits atop a shield volcano 15 km southeast of South Sister.
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Geology and History Summary for Mount Bachelor

Mount Bachelor is a basalt to basaltic andesite summit cone that sits atop a shield volcano 15 km southeast of South Sister.
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Eruption History of Mount Bachelor Volcanic Chain

Four discrete eruptive episodes are recognized.
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Eruption History of Mount Bachelor Volcanic Chain

Four discrete eruptive episodes are recognized.
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Mount Bachelor's Summit

The summit of Mount Bachelor is composed of numerous vents that erupted short, blocky basaltic-andesite lava flows.
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Mount Bachelor's Summit

The summit of Mount Bachelor is composed of numerous vents that erupted short, blocky basaltic-andesite lava flows.
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Mount Bachelor Ski and Recreation Area

The likelihood of a volcanic eruption from Mount Bachelor affecting the ski area is relatively low, as the type of eruption that formed the mountain is typically a single-duration eruptive event.
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Mount Bachelor Ski and Recreation Area

The likelihood of a volcanic eruption from Mount Bachelor affecting the ski area is relatively low, as the type of eruption that formed the mountain is typically a single-duration eruptive event.
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