alluvial sediment
alluvial deposit
alluvium
alluvion

Sand and gravel has been mined from the alluvial deposits in recent years.

Except for recent alluvial deposits, there are no other known Cenozoic rocks.

Only the alluvial deposits are being worked employing 15,000 miners around the Lake.

Several of the islands have been joined to the mainland by alluvial deposits.

These are mixed with more recent alluvial deposits from the Aude valley.

Over time the site was buried under alluvial deposits, up to 8 meters deep, long thought to be the result of river flooding.

It can be found in boggy habitats and recent alluvial deposits.

For many years gold was abundant in alluvial deposits.

He had scouted the coast earlier and seen several alluvial deposits.

The river has been affected by mining in the region with alluvial deposits.