Salt deposits could have come from groundwater, not standing water.

References
Andrews-Hanna J., et al. Nature, 446. 163 - 166 (2007).
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Sanderson, K. Not a sea, but a seep, on Mars. Nature (2007). https://doi.org/10.1038/news070305-8
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DOI: https://doi.org/10.1038/news070305-8