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Beacon Rock is not a volcano, but rather a volcanic plug. It was formed from the solidified magma that filled the vent of an ancient volcano.

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2mo ago
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13y ago

Beacon rock is not a volcano, but rather is the basaltic andesite volcanic neck or plug (core) of an ancient volcano, the softer outside of which was eroded by the Missoula Floods.

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Q: What type volcano is beacon rock?
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Beacon rock was once a volcano but was eroded by?

Missoula floods


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