A photo of Shastina.

The concave bowl shape on the northwest side of Shastina is a glacially carved cirque overprinted by an avalanche chute. Shastina is one of at least four volcanic edifices that combine to form the larger stratovolcano called Mt. Shasta (Christiansen, 1990). This photograph was taken in the town of Weed near the intersection of Interstate 5 and US Highway 97. Mt. Shasta has erupted at least a dozen times in the last 10,000 years, with the most recent eruption about 200 years ago. Eruptions have produced lava flows, lava domes, pyroclastic flows, and ash falls that have affected the region extending tens of kilometers around the volcano summit (Miller, 1980).