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Global Volcanism Program | Image GVP-02997

The western slopes of Mount Jefferson rise above forested hills composed of older Pleistocene volcanic rocks.  Cinder cones younger in age than the eroded main edifice of Mount Jefferson, which ceased activity during the late Pleistocene, are located to the south. Photo by Lee Siebert, 1982 (Smithsonian Institution).

The western slopes of Mount Jefferson rise above forested hills composed of older Pleistocene volcanic rocks. Cinder cones younger in age than the eroded main edifice of Mount Jefferson, which ceased activity during the late Pleistocene, are located to the south.

Photo by Lee Siebert, 1982 (Smithsonian Institution).


Jefferson