Global Volcanism Program | Image GVP-03211
Shastina lava dome forms the largely snow-free ridge to the left of the summit of Mount Shasta. During the growth of Shastina in the early Holocene, andesitic lava flows traveled up to 14 km, and pyroclastic flows swept down its flanks, covering much of the areas that are now the sites of the towns of Weed and Mt. Shasta.
Photo by Lyn Topinka, 1984 (U.S. Geological Survey).