alluvium
Noun
Meaning
Deposits of earth, sand, gravel, and other transported matter, made by rivers, floods, or other causes, upon land not permanently submerged beneath the waters of lakes or seas.
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That ere long, now that curiosity has been so much excited on this subject, some human remains will be detected in the older alluvium of European valleys, I confidently expect.
The Indo-Gangetic belt is the world's most extensive expanse of uninterrupted alluvium formed by the deposition of silt by the numerous rivers.
Similarly Romney Marsh and Dungeness have been formed by accumulation of alluvium.
These are small lakes formed when large ice blocks that are trapped in alluvium melt and produce water-filled depressions.
Thus, along much of the Brent's present-day course, one can make out the water meadows of rich alluvium, which is augmented by frequent floods.
In the ancient alluvium that makes up most of the Los Angeles basin, oil, grease, and bacteria break down.