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317; Lecture 20

TermDefinition
Lag deposits a residual accumulation of coarse rock fragments on a surface after the finer material has been blown away by the wind
Desert pavement forms in desert environments
Stone pavement forms in alpine and periglacial environments with sparse vegetation
Deflation hollows depressions that form unconsolidated material as fine grained sediment is carried away by deflation
Yardangs streamlined, sharp, and sinuous ridges that extend parallel to the wind and are separated by parallel depressions
Ventifacts stones shaped by the erosive action of windblown sand
Dunes collections of loose sand deposited by the wind
Stoss upwind side of dune, gentle slope
Lee downwind side of dune, steep slope
Free dunes deposited in flat, expansive areas with little obstructions  Deposited by sedimentation and accretion
Anchored dunes deposition controlled by vegetation and topography
Dunefields sand covers area <30,000 kilometers squared
Sand sea sand covers area >30,000 kilometers squared
Crescentic/Barchan dunes crescent-shaped mounds that bend away from wind direction, unidirectional wind
Linear/Transverse dunes straight or slightly sinuous ridges longer than they are wide, bidirectional wind but one direction is dominant over the other
Star dunes radially symmetrical, arms radiate from a central mound, multidirectional wind
Dome dunes oval, circular mounds lacking a slipface, rare and not well understood
Parabolic dunes u-shaped, similar form to crescentic, but the dune bends upwind instead of downwind
Loess a loosely compacted yellowish-brown deposits of windblown silt particles
Created by: turboqueen