Global Volcanism Program | Image GVP-03198
Steep-sided Black Buttes lava dome on the lower SW flank of Mount Shasta, was formed during the early Holocene at the same time as the formation of Shastina lava dome on the upper west flank. Pyroclastic flows accompanying growth the Black Buttes traveled up to 11 km to the south. The notches on the western flank (left) mark the tops of several individual domes of the composite Black Buttes lava dome.
Photo by Lee Siebert, 1981 (Smithsonian Institution).