Neither is to be found in alluvial sands or gravels and both have to be mined from the parent rock.

The whole park is on alluvial sands.

It grows in tall forests in more sheltered areas, on clay or loam soils, and alluvial sands.

Below the hard layer of gravel, the alluvial sand was soft and easily dug.

The South Para River has limited soil developments and consists of alluvial sands and gravels.

However, the wadi bed at the new dam site consists of alluvial sand and gravel material 30-50 m thick.

The name is from the Spanish word placer, meaning "alluvial sand".

The wall was built on shallow medieval foundations on alluvial sand and clay close to the tidal River Coquet.

Because of their high density monazite minerals will concentrate in alluvial sands when released by the weathering of pegmatites.

It only grows in deep spits of windblown, alluvial sand.