Onset and migration of spiral troughs on Mars revealed by orbital radar

@article{Smith2010OnsetAM,
  title={Onset and migration of spiral troughs on Mars revealed by orbital radar},
  author={Isaac B. Smith and John W. Holt},
  journal={Nature},
  year={2010},
  volume={465},
  pages={450-453}
}
The landscape of the north polar layered deposits of Mars (NPLD) is dominated by a pinwheel array of enigmatic spiral troughs. The troughs have intrigued planetary scientists since the Mariner 9 spacecraft returned the first close-up image in 1972, but conclusive evidence of their origin has remained elusive. Debate continues regarding all aspects of the troughs, including the possibility that they have migrated, their age in relation to the current NPLD surface, and whether they are… 

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References

SHOWING 1-10 OF 47 REFERENCES
Geologic history of the polar regions of Mars based on Mars Global surveyor data. II. Amazonian period
Based on Mars Orbiter Laser Altimeter (MOLA) and Mars Orbiter Camera (MOC) observations of Amazonian polar layered deposits' (PLD) morphology, composition, and thickness, we conclude that the PLDs
The construction of Chasma Boreale on Mars
TLDR
New data from the Mars Reconnaissance Orbiter are used to show that Chasma Boreale is instead a long-lived, complex feature resulting primarily from non-uniform accumulation of the NPLD, and that topography existing before the N PLD began accumulating influenced successive episodes of deposition and erosion, resulting in most of the present-day topography.
Mars North Polar Deposits: Stratigraphy, Age, and Geodynamical Response
TLDR
The Shallow Radar (SHARAD) on the Mars Reconnaissance Orbiter has imaged the internal stratigraphy of the north polar layered deposits of Mars, revealing a laterally continuous deposition of layers which typically consist of four packets of finely spaced reflectors separated by homogeneous interpacket regions of nearly pure ice.
Mariner 9 observations of the surface of Mars in the north polar region
During the Mariner 9 extended mission the recession of the north polar ice cap was monitored for 130 days. The edge of the cap displayed a peculiar polygonal outline during most of this period.
The Role of Eolian Processes in Forming Surface Features of the Martian Polar Layered Deposits
Abstract The major topographic features of the martian polar layered deposits include the conspicuous spiral troughs, subtle undulations, broad reentrants (chasma), steep, arcuate scarps, and dune
...
1
2
3
4
5
...