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Inland sand dunefields are composed largely of unconsolidated sand deposited by wind (aeolian processes). These inland sand dunefields can store groundwater in local, intermediate or regional groundwater flow systems and also in perched aquifers formed by layers of clay dominated material. Unconsolidated sedimentary aquifers in inland sand dunefields may provide a range of ecosystems with water required to support their plant and animal communities, ecological processes and delivery of ecosystem services.
Palustrine (e.g. swamps) and lacustrine (e.g. lakes) wetlands and riverine (e.g. streams and rivers) water bodies on the edges of inland sand dunefields may depend on the surface expression of groundwater.
Terrestrial vegetation on inland sand dunefields may depend on the subsurface presence of groundwater in these unconsolidated sedimentary aquifers where groundwater is typically accessed through the capillary zone above the watertable.
Unconsolidated sedimentary aquifers in inland sand dunefields may also support aquifer ecosystems which can be indicated by the presence of stygofauna.