"Coral" ? I see evidence of past volcanism; way past by the looks of the erosion. Does coral even fossilize? I think coral is calcimine and breaks down to powder when exposed, but I am not sure. Furthermore, there is no evidence of calcimine of organic origin, on Mars yet.<br /><br />I am not sure I am utilizing the right terminology, so do the research. I have seen chalky calcimine like stuff, but I don't know if it is the right stuff. If you are looking for fossils, your best bet would be, shellfish, e.g. (Muscles, Clams, Luncheons, etc.), because those life-forms are primitive precursors. Vegetation, (Tree trunks, leaves, etc.) are more evolved.