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Global Volcanism Program | Image GVP-06558

Hillman Peak, the westernmost andesitic stratovolcano of Mount Mazama, is partially dissected by Crater Lake caldera. The base of the cone consists of thin andesite lava flows; these are overlain by bedded fall deposits. The upper part of the cone, seen here, consists of andesitic lava flows erupted about 67,000 years ago. The snow-capped peak on the far horizon to the north is Mount Thielsen, a Pleistocene volcano. Photo by Lee Siebert, 1997 (Smithsonian Institution)

Hillman Peak, the westernmost andesitic stratovolcano of Mount Mazama, is partially dissected by Crater Lake caldera. The base of the cone consists of thin andesite lava flows; these are overlain by bedded fall deposits. The upper part of the cone, seen here, consists of andesitic lava flows erupted about 67,000 years ago. The snow-capped peak on the far horizon to the north is Mount Thielsen, a Pleistocene volcano.

Photo by Lee Siebert, 1997 (Smithsonian Institution)

Keywords: stratovolcano


Crater Lake