Lassen Volcanic. Slab window. Slab windows. Lassen Volcanic. Slab Window. Dacite dome. Lassen Peak. Chaos Crags. Former location of Mt. Tehama. Brokeoff Mountain (Mt. Tehama remnant). More remnants of Mt. Tehama. Mount Dillar. Pilot Pinnacle. History.
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25,000 - 31,000 years old
Lake Helen: Filled crater, caldera or cirque?
Lake Helen fills a cirque