Evidence for an ancient martian ocean in the topography of deformed shorelines

@article{Perron2007EvidenceFA,
  title={Evidence for an ancient martian ocean in the topography of deformed shorelines},
  author={J. Taylor Perron and Jerry X. Mitrovica and Michael Manga and Isamu Matsuyama and Mark A. Richards},
  journal={Nature},
  year={2007},
  volume={447},
  pages={840-843}
}
A suite of observations suggests that the northern plains of Mars, which cover nearly one third of the planet's surface, may once have contained an ocean. Perhaps the most provocative evidence for an ancient ocean is a set of surface features that ring the plains for thousands of kilometres and that have been interpreted as a series of palaeoshorelines of different age. It has been shown, however, that topographic profiles along the putative shorelines contain long-wavelength trends with… 

Timing of oceans on Mars from shoreline deformation

TLDR
It is found that the shorelines must have formed before and during the emplacement of Tharsis, instead of afterwards, as previously assumed, and this implies that oceans on Mars formed early, concurrent with the valley networks, and point to a close relationship between the evolution of oceans onMars and the initiation and decline of ThARSis volcanism.

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    The Astrophysical Journal
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Abstract Based on our update to the global map of the proposed paleoshorelines from the 1980s using high-quality global image and topography data acquired since the late 1990s, this chapter assesses

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...

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