yardang


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yardang

[′yär‚daŋ]
(geology)
A long, irregular ridge with a sharp crest sited between two round-bottomed troughs that have been carved by wind erosion in a desert region.
References in periodicals archive ?
Linking the Antelope Valley and Earth's closest neighboring planet are geological curiosities called yardangs or fossilized sand dunes - elongated, streamlined hills carved out by the wind that clustered on one edge of the dry lake bed.
The Rogers yardangs are analogous to features we thought would - and did - show up on Mars,'' said Ward, a U.
Ward has been coming to study the yardangs off and on since 1977 and was in the Antelope Valley in October to work on a documentary on Mars.
Yardangs are streamlined hills carved from bedrock or any consolidated or semi-consolidated material by abrasive dust and sand particles carried in the wind.
The orientation of the yardangs leads scientists to theorise that strong north-northeasterly winds (from the lower right in the image) both deposited the original sediments and then caused their subsequent erosion in a later drier period of martian history.
He and his team then visited the Qaidam Basin to collect more information about the yardangs, the history of wind erosion and the dust.
In addition, the winds sculpt the yardangs (streamlined wind-rocks) of Lob Nor and the Qinghai Nanshan.
New HiRISE images reveal surface texture and fine-scale features that are giving scientists insight on how yardangs form.
HiRISE is showing us just how interesting layers in yardangs are," Bridges observes.
The findings suggest that the linear dunes are most likely of erosional origin similar to yardangs with orientations controlled by strikes of joints.
The geoscientists figured out wind's rock-sculpting abilities by studying gigantic wind-formed ridges of rock called yardangs.
Then Kapp and his team went to the Qaidam Basin to collect more information about the yardangs, the history of wind erosion and the dust.