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Three Fingered Jack is a Pleistocene-era volcano in the Cascade Range. It's a glaciated shield volcano — a type of volcano formed around fluid magma flows — and consists mostly of basaltic andesite lava, a type of volcanic rock containing around 55% silica. It's currently regarded as extinct. Sources agree that the volcano was first summitted in 1923, but disagree who summited it. Some say it was a group of six boys from Farewell, Oregon, others claim it was members of the Mazama tribe.

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