Sentinel Rock
28. View northeast of Sentinel Rock from offshore from Kerr Notch (Panorama J). Two thick flows of dacite of Sentinel Rock (unit dr; 3065 ka here) fill a glacial valley carved in thinner flows of andesite of Kerr Notch (unit ak; 3406 ka near here, Panorama I). Outcrop at lake level, left center, is andesite of phantom cone (unit apn; 34620 and 40312 ka near here).
Photograph by Charles R. Bacon.