On December 8, 2014, a panel of NASA scientists discussed ( archive 62:03) the latest observations of Curiosity about how water may have helped shape the landscape of Mars, including Aeolis Mons, and had a climate long ago that could have produced long-lasting lakes at many Martian locations [REF].
On October 8, 2015, NASA confirmed that lakes and streams existed in Gale crater 3.3 - 3.8 billion years ago delivering sediments to build up the lower layers of Mount Sharp [REF].