Landslides		(back to exercise)
	Rubble Creek Fact Sheet Site of two large debris avalanches and several debris flows during the Holocene. Source of the landslides is The Barrier, which is a precipitous rock face formed by a 300 m thick lava flow which abutted against a glacier occupying Cheakamus valley in the late glacial. Much of the landslide debris from this cliff has formed a fan at the mouth of Rubble Creek. The fan consists of 5 - 10 landslide units, each 5 - 10 m in thickness. Total volume ~ 170 million cubic metres. Most recent failure occurred in 1855-56. That avalanche (~ 30 million cubic metres) traveled 6 km down Rubble Creek at a speed of 60 m/s in the upper part of the path, and 25-40 m/s down-valley.