Global Volcanism Program | Image GVP-02834
East Dome, the rounded lava dome to the left, is seen in this 1978 view from the Plains of Abraham on the NE side of Mount St. Helens. An explosive eruption accompanied emplacement of the dome on the lower E flank. This eruption took place near the during the Sugar Bowl Eruptive Period during 900 to 850 CE.
Photo by Rick Hoblitt, 1978 (U.S. Geological Survey).