Global Volcanism Program | Image GVP-03044
Early morning alpenglow gilds the summit of Mount Washington, one of the most distinctive landmarks of the central Oregon Cascades. Mount Washington is an extensively eroded basaltic shield volcano capped by a steep-sided central plug. The central edifice has not been active since the late Pleistocene, but a series of small spatter cones on its NE flank about 4 km from the summit erupted some 1300 years ago.
Photo by Lee Siebert, 1995 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.