This has been reported in dailymail.co.uk dated 9 October 2015.
The images show evidence of sediments transported southward by shallow streams to the boundary of an ancient lake. It may be recalled that recently NASA scientists had confirmed that current water flows on Mars.
As explained by scientists - the Gale crater floor today is the lowest topographic depression for over 1,000-Km in any direction, including the northern plains. It seems water collected there, in surface and subsurface reservoirs. And that had been happening for a geologically and perhaps biologically relevant period of time.
Moreover, observations from the rover tend to suggest that a series of long-lived streams and lakes existed at some point between about 3.8 to 3.3 billion years ago. These delivered sediment that slowly built up the lower layers of Mount Sharp.
Obviously, a conclusion can be reached that there were ancient lakes on Mars.
(Image courtesy wikimediacommons.org)
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