On The Beach

Unambiguous evidence that Shalabatana Vallis on Mars was once occupied by a lake fed by a broad delta - a pretty big lake too (about the size of Lake Champlain). Lasted beyond the point when Mars was supposed to have cooled after its brief warm wet period, so it looks like climatological models might need revised. Long gone now, of course, but what might be found in those fossil beaches and sediment fans?