There was very definitely large* amounts of water on Mars, and there is also evidence of salinity[1], so it seems possible that there would be saline in volume

There was very definitely large* amounts of water on Mars, and there is also evidence of salinity[1], so it seems possible that there would be saline in volume to produce deposits. * - not compared to Earth, but more than you would think from looking at the surface - https://en.wikipedia.org/wiki/Water_on_Mars https://en.wikipedia.org/wiki/Water_on_Mars [1] - http://nature.com/articles/doi:10.1038/ngeo2546 http://nature.com/articles/doi:10.1038/ngeo2546