A reference to the loose accumulation of rock and soil debris or deposits at the bottom of a slope: When hiking, Eugene and Fritz noticed a colluvial amount of sediment or earth at the bottom of the cliff.

Colin, the geologist, was fascinated by the colluvial accumulation of rock fragments, silt, sand, and gravel that was deposited at the bottoms of the steep sides of the hills.

Some descending surfaces are formed by the accumulation of small pieces of colluvial rock fragments that have been transported down the sides of hills or mountains by flowing water or snow slides.

Colluvial material typically gathers in the dry valleys of chalk-lands and also at the foot of escarpments or valley sides.