Recent ice ages on Mars

@article{Head2003RecentIA,
  title={Recent ice ages on Mars},
  author={James W. Head and John F. Mustard and Mikhail A. Kreslavsky and Ralph E. Milliken and David R. Marchant},
  journal={Nature},
  year={2003},
  volume={426},
  pages={797-802}
}
A key pacemaker of ice ages on the Earth is climatic forcing due to variations in planetary orbital parameters. Recent Mars exploration has revealed dusty, water-ice-rich mantling deposits that are layered, metres thick and latitude dependent, occurring in both hemispheres from mid-latitudes to the poles. Here we show evidence that these deposits formed during a geologically recent ice age that occurred from about 2.1 to 0.4 Myr ago. The deposits were emplaced symmetrically down to latitudes of… 
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Cliffs on Mars expose water ice sheets present just below the surface in many locations, and the vertical structure of Martian ice-rich deposits are expected to preserve a record of ice deposition and past climate.
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