Ice Peak Formation

The Ice Peak Formation is a Pleistocene volcanic unit in northwestern British Columbia within the Mount Edziza volcanic complex, dated to about 1 million years ago and recognized as one of the complex’s larger and younger formations. Erupted mostly from Ice Peak, it is the most lithologically diverse formation in the complex, containing basaltic, intermediate, and trachytic rocks. Geologists divide it into lower and upper assemblages: the lower is largely a basaltic shield volcano with lava flows extending widely across the Big Raven Plateau, while the upper includes Ice Peak’s summit area, The Neck, Camp Hill, Cache Hill, and the Ornostay and Koosick bluffs. Its rocks preserve abundant evidence of eruptions interacting with glacier ice.

British Columbia · Canada