Re: Here's a couple
Cool image. There are apparent small greenish areas on some rocks. The colors on Mars are uncertain but Gil Levin has used this to suggest there could be lichen on Mars:
Color and Feature Changes at Mars Viking Lander Site, Journal of Theoretical Biology, (1978) 75, 381-390.
http://www.biospherics.com/mars/color/color.htm
Bob Clark
