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The early eruptive stages of Mount St. Helens are known as the "Ape Canyon Stage" (around 40-35,000 years ago), the "Cougar Stage" (ca. 20-18,000 years ago), and the "Swift Creek Stage" (roughly 13-8,000 years ago.

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13y ago
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200,00 years ago

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Q: What was the first eruption of Mount St. Helens?
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