Mars: Ancient fingerprints in the clay

@article{Catling2007MarsAF,
  title={Mars: Ancient fingerprints in the clay},
  author={David C. Catling},
  journal={Nature},
  year={2007},
  volume={448},
  pages={31-32}
}
The thermodynamics of ancient clays on Mars seems inconsistent with the idea that a thick atmosphere of carbon dioxide caused a warm, wet era in the planet's early history. What did cause it remains an enigma. 

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