Global Volcanism Program | Image GVP-02828
Rocks of the pre-1980 summit lava dome are visible in this 1978 photo of the west side of Mount St. Helens with Mount Adams in the background. Growth of the Summit Dome occurred between about 1630-1720 CE at the end of the Kalama eruptive period. The dome produced pyroclastic flows and lahars down all the flanks.
Photo by Rick Hoblitt, 1978 (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.