Could intelligent life have possibly evolved as it did here on earth? We know that life started quite early in earth's history.
NASA's Opportunity rover spent a full year around the outer edge in early 2007 and a full year inside the crater for close-up imaging. It entered into the crater in Nov 2007 and exited in Aug 2008. Unfortunately Opportunity was not in the vicinity of Cape St. Vincent (1/4 mi away) to do any close-up imaging as it did at Cape Verde, Duck Bay, Cabo Frio section.
We're left to wonder what any close-up image would reveal.
ORIGINAL NASA SOURCELINK HERE (located far-right midsection of outcropping. Download "Full-Res JPEG"): http://