detritus

noun4

1. •
   Pieces of rock broken off by ice, glacier, or erosion.
2. •
   Organic waste material from decomposing dead plants or animals.
3. •
   Any debris or fragments of disintegrated material.

   • But of course: no clutter. No newspapers, no renegade scraps of domestic detritus, no rubber bands, paper clips, coupons, pens or pencils, notebooks, magazines. No knives. Where were the knives? — 2001
4. •
   Rock consisting of accumulated debris from decayed rocks, like sand, that often is joined by cement.