Martian Life's Last Stand?...
Image: NASA/JPL-Caltech A... .... The deposits are a type of clay called smectites , which contain a blend of silica with... ...presence of water. [...] The Noctis Labyrinthus smectites are believed to have formed around 2...
https://www.neatorama.com/2011/09/28/martian-lifes-last-stand/
