Tropical to mid-latitude snow and ice accumulation, flow and glaciation on Mars

@article{Head2005TropicalTM,
  title={Tropical to mid-latitude snow and ice accumulation, flow and glaciation on Mars},
  author={James W. Head and Gerhard Neukum and Ralf Jaumann and Harald Hiesinger and Ernst Hauber and Michael H. Carr and Ph. Masson and Bernard H. Foing and Harald Hoffmann and Mikhail A. Kreslavsky and Stephanie C. Werner and Sarah Milkovich and Stephan van Gasselt},
  journal={Nature},
  year={2005},
  volume={434},
  pages={346-351}
}
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 related evidence of extremely ice-rich glacier-like viscous flow and sublimation. Together with new evidence for recent ice-rich rock glaciers at the base of the Olympus Mons scarp superposed on larger Late Amazonian debris-covered piedmont glaciers, we interpret these deposits as evidence for… 

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TLDR
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Extensive valley glacier deposits in the northern mid-latitudes of Mars : Evidence for Late Amazonian obliquitydriven obliquitydriven obliquitydriven climate change

Understanding spin orbital parameter-driven climate change on Mars prior to ~ 20 Ma ago requires geological evidence because numerical solutions for that period are chaotic and non-unique. We show
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