DictionarydetritusAccumulated debris
noun

detritus

dih-TRY-tus/dɪˈtraɪtəs/

Loose remains left by decay or breakdown.

Chips, grit, and dust form a layer of detritus beneath the crumbling rock.

A weathered, crumbling rock with a loose apron of detached chips, grit, and dust gathered beneath its visibly eroded edge.
Etymology

The pieces describe wearing away. The word shifted from the process of erosion to the rock fragments it produces, then broadened to debris and waste material generally.

In context

Lighthouse Horror30:34
explain something about seeing the unexpected shape sending a ripple of discomfort through me at first i took what i saw to be a massive deposit of seaweed and other detritus of the sea
"Beware The Cloaked Woman Of Crabber's Bay" | Creepypasta | Horror Story

More examples

  • Tiny organisms feed on detritus from decaying plants.
  • Rain washes rocky detritus down the eroding hillside.
  • She clears the winter's detritus from the garden beds.

Forms

detrital adjective — Made of loose fragments or remains.

Similar words

debris
Covers scattered waste generally, not necessarily from decay or erosion.
rubble
Specifically broken stone or masonry, often from demolished structures.