Skip to main content
U.S. flag

An official website of the United States government

North Sister volcano's east face (750 m, 2460 ft high) consists of ...

1905 (approx.)

Detailed Description

East face of North Sister, 750 m high. Consists of about 100 thin mafic lava flows and intercalated layers of red scoria, capped by thick summit lava flows. Remnant of Thayer Glacier feeds cirque lake. Pervasively altered yellow-orange buttress on right, 250 m thick, consists of east-dipping, palagonitized, ash-rich fragmental flow deposits.

Sources/Usage

Public Domain.

Hildreth et al., 2013 Photograph by John Scurlock.