Ryder and Kermsuh Lakes Trail Professional Review and Guide
"Ryder and Kermsuh Lakes are the other two major lakes, besides Amethyst Lake, that lie within the Stillwater Drainage of the High Uintas Wilderness Area. When ancient glaciers were carving the glove-shaped valley during the past ice age, three large fingers were gouged out of its southern flanks. Today we call these depressions Amethyst Basin, West Basin, and Middle Basin.
These high mountain basins became natural places for the formation of lakes when the glaciers melted; hence the presence of Ryder, Kermsuh, and Amethyst lakes. Amethyst Lake, of course, is located in Amethyst Basin. Kermsuh Lake is in West Basin and Ryder is in Middle Basin. All are surrounded almost entirely by the billion-year-old Precambrian quartzite cliffs that define the Uinta Crest."