Erebus Highway (3) - Sol 529

"...And have you noticed how the terrain seems to be changing as we get south of Purgatory? Fewer tall dunes, more pebbles in the troughs, even what might be tiny outcrops of bedrock? I don't want to jump to conclusions, but the driving definitely looks a little nicer here than it did a hundred meters back...".

Source: Steve Squyres - Principal Investigator Mars Rovers