Talus cone P576796

Topple failures involve the forward rotation and movement of a mass of rock, earth or debris out of a slope.

This kind of slope failure generally occurs around an axis (or point) at or near the base of the block of rock.

A good example of a site experiencing topple failures is Aldborough, UK.

A topple often results in the formation of debris or a debris cone at the base of the slope; this pile is called a talus cone. New talus cones don't have any plants growing on them. Old talus cone can have weeds and even trees on them.

Portland topple

Rock topple
Debris topple
Earth topple