Glacier Peak Professional Review and Guide
"Glacier Peak is a cinder cone, much younger than the plateau upon which it stands. It has been quite active since the end of the most recent ice age, with numerous eruptions, pyroclastic flows, and mudflows. The crater is obscured by products of erosion and filled with snow and ice. The southwestern part of an older crater with an eroded rim is the true summit. Due to Glacier Peak’s northern latitude and high snowfall, glaciers cover all but its southern slope. These ice rivers show great diversity, as some have advanced while others have retreated in recent years. The major central glaciers are the Chocolate, Scimitar, and Sitkum. The peripheral glaciers are the Suiattle and White Chuck, which is the largest of the Glacier Peak system."