alluvial sediment
alluvial deposit
alluvium
alluvion

The soil is black and contains fertile alluvial sediment.

The few stones they found were alluvial sediment, washed into the sea by the Bahoruco River.

Interbedded alluvial sediments are also found between many of the flows.

However, much of the alluvial sediments that exist here are sand, silt, and clays.

The soil is mostly sandy, with clay soils from alluvial sediments along the Save River.

The formation of this basin eventually refilled with soft fluvial and alluvial sediments.

Its soils consist of alluvial sediment and clay.

Groundwater occurs in silty to sandy layers of the alluvial sediments.

Finding the location was difficult because the site had been buried over time by more than four meters of alluvial sediment from the Crati delta.