Examples of alluvium

• Regenerative growth in fossil horsetails following burial by alluvium.

• Under backwater conditions, fine-grained alluvium of 15 m thickness was deposited in the reach upstream from the lava dam.

• On average, surface soil nutrient content is highest in the alluvium, lowest in granite and intermediate in sedimentary soils.

• This recent alluvium is topped by welldrained soils that remain moist through seepage and capillarity during the dry season; they are prime agricultural land.

• These losses cannot be compensated by weathering of the parent material, since the old alluvium on which these soils have evolved has been thoroughly weathered before sedimentation.

• Both plutons seem to represent a single entity as they are contiguous, and the intervening area between them of about 1000 m is concealed under alluvium and sand dunes.

• The river valley consists of porous alluvium that constitutes a huge aquifer that is recharged mostly from the river while providing late season flow back into the river.

• The road crosses alternating layers of sandstone, shale and mudstones which are overlain by variable depths of glacial clays, sands and gravels, alluvium and industrial fill.