Site of many large debris avalanches and several moderate to large debris flows during the Holocene.
The source of the landslides is the west flank of the volcanic cone of Mt. Garibaldi, which may have been partly built on top of valley ice in the Late Glacial. This flank is therfore subject to collapse.
Much of the landslide debris from this cliff has formed a fan at the mouth of the Cheekye River. The fan can be divided into upper, middle and lower sections by rock ridges which cross it.
The fan consists of many landslide units, only some of which have been adequately dated. Total volume ~ 2.5 - 3 billion cubic metres.
Debris flows have continued in historic times. In 1958 a debris flow swept down the Cheekye River and formed a 5 m dam across the Cheakamus at its mouth. A similar event occurred in the 1930’s. Flow volumes were ~100 000 cubic metres.
