South Sister's NW summit, basaltic andesite lava and scoria cap on ...

South Sister's northwest summit, basaltic andesite lava and scoria ...

Detailed Description

Lost Creek Glacier and its cirque are in center, and Eugene Glacier and its cirque are toward bottom left. Fingerlike lobes of dacite lava dribble down northwest ridge atop fragmental deposit and beneath capping agglutinate. Entire edifice visible here was built between 30 and 20 ka.

Details

Image Dimensions: 4200 x 2800

Source:


Hildreth et al., 2013