The land near the river was clear of trees due to burns by the Indians, and covered in nutrient-rich river silt from floods.

Your trousers and your shirt were freshly stained with river silt.

As the flood water receded, the river silt left a level playing field - ideal for grazing animals or, playing team ball games.

The bar is fed by river silt, but its most navigable channel has been dredged to a depth of 55 feet.

You're just shifting tons of river silt, screening, washing - yes, I guess it could peter out like that, no warning.

Repeated flooding in the past has left the valley floor covered in rich river silt.

However, the grappling hook refused to catch its prongs in anything but river silt.

Toward the Sound end of the valley, the fields are rich with river silt, the soil ranging from black velvet to a blond sandy loam.

It was a seaport, now buried under river silt.

They are presumably buried deep beneath Uruk sites or covered by river silt.