Now wait a second
You mean to tell me that there were no oceans on Mars in the past?!? Well, so much for my Mayan surfers from Mars theory to explain who made the "face."
Actually though, this is a very important piece of work. It not only confirms that MGS can detect carbonates (something Barry has been denying for some time), but it also clearly suggests that theories about Mars once sporting oceans may be all wet.