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Lassen Volcanic

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

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  1. Lassen Volcanic

  2. Slab window

  3. Slab windows

  4. Lassen Volcanic Slab Window

  5. Dacite dome

  6. Lassen Peak Chaos Crags

  7. Former location of Mt. Tehama

  8. Brokeoff Mountain (Mt. Tehama remnant)

  9. More remnants of Mt. Tehama Mount Dillar Pilot Pinnacle

  10. 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

  11. PROJECTED HEIGHT OF MT TEHAMA MOUNT LASSEN BROKEOFF MOUNTAIN

  12. 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

  13. The great dacite dome of Lassen Peak 25,000 - 31,000 years old

  14. Talus

  15. Lake Helen: Filled crater, caldera or cirque?

  16. Lake Helen fills a cirque

  17. Tarn

  18. Crescent Crater

  19. Lassen Peak Chaos Crags

  20. Lassen Peak Chaos Crags

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