The Geology and Petrography of Crater Lake National Park, 1902
LAVAS OF MOUNT MAZAMA.a
STEEL BAY ANDESITE AREA.
The area of andesite on the outer slope of the rim represents a large flow from the rim at Steel Bay northeast toward Bear Creek. Like the Round Top area, it lies between two later flows of dacite, and to the north passes out of sight beneath the pumice plain. It is a typical andesite (29) and much glaciated.