Radar Sounding Evidence for Buried Glaciers in the Southern Mid-Latitudes of Mars

@article{Holt2008RadarSE,
  title={Radar Sounding Evidence for Buried Glaciers in the Southern Mid-Latitudes of Mars},
  author={John W. Holt and Ali. Safaeinili and Jeffrey J. Plaut and James W. Head and Roger J. Phillips and Roberto Seu and Scott D. Kempf and Prateek Choudhary and Duncan Alexander Young and Nathaniel E. Putzig and Daniela Biccari and Yonggyu Gim},
  journal={Science},
  year={2008},
  volume={322},
  pages={1235 - 1238}
}
Lobate features abutting massifs and escarpments in the middle latitudes of Mars have been recognized in images for decades, but their true nature has been controversial, with hypotheses of origin such as ice-lubricated debris flows or glaciers covered by a layer of surface debris. These models imply an ice content ranging from minor and interstitial to massive and relatively pure. Soundings of these deposits in the eastern Hellas region by the Shallow Radar on the Mars Reconnaissance Orbiter… 
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References

SHOWING 1-10 OF 65 REFERENCES
Accumulation and Erosion of Mars' South Polar Layered Deposits
TLDR
The sounding radar SHARAD on the Mars Reconnaissance Orbiter mapped detailed subsurface stratigraphy in the Promethei Lingula region of the south polar plateau, Planum Australe, indicating recent erosion of ice-rich layered deposits.
Tropical to mid-latitude snow and ice accumulation, flow and glaciation on Mars
Images from the Mars Express HRSC (High-Resolution Stereo Camera) of debris aprons at the base of massifs in eastern Hellas reveal numerous concentrically ridged lobate and pitted features and
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.
Formation of Glaciers on Mars by Atmospheric Precipitation at High Obliquity
TLDR
High-resolution climate simulations performed with a model designed to simulate the present-day Mars water cycle but assuming a 45° obliquity points to an atmospheric origin for the ice and reveals how precipitation could have formed glaciers on Mars.
Subsurface Radar Sounding of the South Polar Layered Deposits of Mars
TLDR
The ice-rich south polar layered deposits of Mars were probed with the Mars Advanced Radar for Subsurface and Ionospheric Sounding on the Mars Express orbiter, suggesting a composition of nearly pure water ice.
Radar Soundings of the Subsurface of Mars
TLDR
Data from the northern lowlands of Chryse Planitia have revealed a shallowly buried quasi-circular structure about 250 kilometers in diameter that is interpreted to be an impact basin and a planar reflector associated with the basin structure may indicate the presence of a low-loss deposit that is more than 1 kilometer thick.
The distribution of lobate debris aprons and similar flows on Mars
Planet-wide mapping of lobate debris aprons and other similar flows on Mars shows a strong concentration in two latitudinal bands roughly 25° wide and centered at 40°N and 45°S. This distribution
Ice flow and rock glaciers on Mars
Several geologic features suggest the presence of rock glaciers on the surface of Mars. These features include lobate debris aprons, concentric crater fill and lineated valley fill. The lateral
Recent ice ages on Mars
TLDR
Evidence is shown that dusty, water-ice-rich mantling deposits on Mars formed during a geologically recent ice age that occurred from about 2.1 to 0.4 Myr ago, a key pacemaker of ice ages on the Earth.
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