Geologic Mapping Progress Featured at Smithsonian Insider December 16, 2016May 26, 2012 by sscheidt77 New mapping of Mars shows Medusae Fossae Formation older than once thought Share: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Email a link to a friend (Opens in new window) Email More Share on LinkedIn (Opens in new window) LinkedIn Related