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Arid Landscapes
Arid Landscapes
26
Geology
Undergraduate 2
04/27/2010

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Term
Ers
Definition
Sandy deserts.
Term
Regs
Definition
Rocky deserts; vcover of coarse gravel, pebbles, boulders; more common than Ergs.
Term
Hamada
Definition
Usually bedrock exposure, can be hardpan.
Term
Exotic Streams
Definition
Streams that have sufficient volume to cross desert areas.
Term
Intermittent of Ephemeral Streams
Definition
More than 99% of streams in deserts are of this type.
Term
Playas
Definition
Dry lake beds; often white color due to salts deposited as lake water quickly evaporates.
Term
Differential Erosion
Definition
More resistant rock forms the cliffs, pinnacles, spires etc.
Term
Pediments
Definition
Gently inclined bedrock platform extending out form a mountain front.
Term
Inselbergs
Definition
Isolated steep sided mountains, hills or ridges.
Term
Alluvial Fan
Definition
Fan shaped deposition feature laid down by a mountain stream issuing from a mountain canyon.
Term
Bajada
Definition
Two or more alluvial fans that have coalesced making it difficult to distinguish between them.
Term
Blowout
Definition
Shallow depression where much fine material has been removed.
Term
Desert pavement
Definition
Stone covered surface from which finer materials have been removed.
Term
Yardangs
Definition
Wind eroded/sculpted ridge found in a desert environment; elongate features typically three or more times longer than they are wide and often resembling the inverted hull of a boat.
Term
Aeolian Transportation
Definition
Dust storms; suspended material & saltation of material.
Term
Aeolian deposition
Definition
Loess deposits (wind blow silt & clay).
Term
Barchan
Definition
U-shaped dune, points down wind.
Term
Transverse
Definition
Dune; perpendicular to wind.
Term
Longitudinal
Definition
Dune; parallel to wind.
Term
Seifs
Definition
Very long and/or curved or sinuous longitudinal dunes.
Term
Parabolic
Definition
U-shaped dune; points into the wind.
Term
Star
Definition
Star shaped dune; variable wind directions.
Term
Basin & Range Terrain
Definition
Fault block mountains with pediments, alluvial fans and playas in common.
Term
Mesa & Scarp Terrain
Definition
Area of horizontal terrain with plateaus, mesas, buttes, pinnacles; stair step escarpments common
Term
Badlands
Definition
Usually made of eroded layers of shale with many ravines and gullies dissecting the land.
Term
Loess
Definition
Silt sized particles deposited primarily by the wind; often non-stratified and unconsolidated.
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