This is caused by the slow settling or deposition of the alluvial materials after floods.

Groundwater in the San Joaquin Valley occurs mostly in younger alluvial material.

The Lost Forest soil was formed from lake sediments and alluvial materials.

Lowland soils are considered young and formed from fluvio-marine sediments and alluvial materials.

These indicator minerals are generally sought in stream sediments in modern alluvial material.

An alluvial material of flat slate stones with edges rounded by erosion, typically forming a shingle beach at the seashore.

Workers and engineers cleared alluvial material from the riverbed but ran into uplift faults and pot-holes.

The remaining deposits consisted of the alluvial materials mentioned above.

The project area also contained gold and columbite-tantalite minerals in the alluvial material.

However, the deposits of alluvial materials continually brought onto the island from the Danube completely prevented this from happening.