The majority of dunes in Olympia Undae are transverse dunes.
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Transverse dunes run at a right angle to the prevailing wind direction.
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Where sand is abundant, transverse dunes occur; they are commonly defined as long barchaoid ridges with fairly straight segments that are perpendicular to the wind direction.
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Olympia Undae contains a variety of dune forms and wind-related ( aeolian ) depositional features, including sand sheets, transverse dunes, simple barchan dunes, mega-barchans, and complex barchanoid ridges.
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Optical dating of sediments within the transverse dune ( lunette ) sediments demonstrate aspects of the lakes history into the interglacial period, and show the highest lake level around 131, 000 ?10, 000 yr ago, forming Lake Chillingollah, a megalake filled by increased winter rainfall, that persisted until around 77, 000 ?4000 yr ago.
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:: I found out from this 32-page piece of research that the Sand Hills are composed of mostly complex transverse dunes, and that the aquifer does indeed indirectly stabilize the dunes : it feeds shallow wetland systems, that in droughts can release evaporation that sustains neighbouring prairie grasses . ~ discuss ! " ) 04 : 45, 16 November 2012 ( UTC)
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