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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Former location of Mt. Tehama
Brokeoff Mountain (Mt. Tehama remnant)
More remnants of Mt. Tehama
PROJECTED HEIGHT OF MT TEHAMA
The great dacite dome of Lassen Peak
25,000 - 31,000 years old
Lake Helen: Filled crater, caldera or cirque?
Lake Helen fills a cirque