Ancient oceans, ice sheets and the hydrological cycle on Mars

@article{Baker1991AncientOI,
  title={Ancient oceans, ice sheets and the hydrological cycle on Mars},
  author={Victor R. Baker and Robert Strom and Virginia C. Gulick and Jeffrey S. Kargel and Goro Komatsu and Vishwas S. Kale},
  journal={Nature},
  year={1991},
  volume={352},
  pages={589-594}
}
A variety of anomalous geomorphological features on Mars can be explained by a conceptual scheme involving episodic ocean and ice-sheet formation. The formation of valley networks early in Mars' history is evidence for a long-term hydrological cycle, which may have been associated with the existence of a persistent ocean. Cataclysmic flooding, triggered by extensive Tharsis volcanism, subsequently led to repeated ocean formation and then dissipation on the northern plains, and associated… 

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