alluvium

In his wanderings, he had panned the alluvium of many small streams and had recovered more than the usual amount of gold.

Perhaps the alluvium of a great river like the McKenzie, has determined this displacement.

The soil of Egypt is, then, simply an alluvium mixed with the sand which the winds bring from the Desert.

Alluvium, al-lū′vi-um, n. the mass of water-borne matter deposited by rivers on lower lands:—pl.

The shores of Lake St. Clair are formed of a fertile alluvium, resting on drift.