Global Volcanism Program | Image GVP-03041
The sharp-topped pinnacle of Mount Washington, seen here from east of Santiam Pass on its NE, is a lava plug that caps a heavily eroded shield volcano. The steep-sided lava plug forming the summit was the last major Oregon peak to be climbed, resisting ascent until 1923.
Photo by Lee Siebert, 1982 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.