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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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Lassen Volcanic

Slab Window



Lassen Peak

Chaos Crags




More remnants of Mt. Tehama

Mount Dillar

Pilot Pinnacle


History

  • Mt Tehama composite volcano built 600,000 to 400,000 years ago

  • Mt Tehama collapse(?) and erosion

  • Domes, glaciers and more domes

  • Most recent activity 1914-1921


PROJECTED HEIGHT OF MT TEHAMA

MOUNT LASSEN

BROKEOFF MOUNTAIN


History

  • Mt Tehama composite volcano built 600,000 to 400,000 years ago

  • Mt Tehama collapse(?) and erosion

  • Domes, glaciers and more domes

  • Most recent activity 1914-1917


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




Lassen Peak

Chaos Crags


Lassen Peak

Chaos Crags


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