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 ?
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.
A 30 km-long field of darker dunes can be seen bisecting the yardangs and is thought to have formed at a later epoch.
He and his team then visited the Qaidam Basin to collect more information about the yardangs, the history of wind erosion and the dust.
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.
There are yardangs at other deserts in the world, including some in Iran that are miles long and more than 300 feet high.
The Edwards yardangs were first reported by a Stanford University researcher, Eliott Blackwelder, in the 1930s.
The best guess is that the formation of the yardangs began during the last ice age, 30,000 to 50,000 years ago.
HiRISE is showing us just how interesting layers in yardangs are," Bridges observes.
HiRISE makes clear that some layers in the yardangs are made of softer materials that have been modified by wind, he adds.
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.