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Idaho's forgotten volcanic eruptions

Summary by Helena Independent Record
Although the Yellowstone hotspot burned a swath of volcanic chaos across southern Idaho during the past 17 million years, it was an earlier period of volcanism, unrelated to Yellowstone, that shaped the geology of central Idaho.

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Idaho's forgotten volcanic eruptions

Although the Yellowstone hotspot burned a swath of volcanic chaos across southern Idaho during the past 17 million years, it was an earlier period of volcanism, unrelated to Yellowstone, that shaped the geology of central Idaho.

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Helena Independent Record broke the news in Helena, United States on Friday, January 2, 2026.
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