@Newb: I think if you do some research and figure out the scale of that photo you will find out that those "walls" are a few inches thick.
They are natural geologic features.
I'm eager to find out about the scale. If you have a link to information on scale of Curiosity pictures during these Sols, that'd be much appreciated. If natural, how do you explain the rectangles? Again, I'm not an expert in geology. That's why I was looking for expert input or educated guesses here on off-topic.
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I once spoke to a scientist at JPL while on a tour, and he said that they would LOVE to find evidence of some unnatural structures or extraterrestrial intelligence out there. He went on to say it would be the surest path to pretty much unlimited funding to go and figure it out, and it would make no sense to try and cover it up.
Interesting! I hope they do more investigation in those patterns in the days ahead. More funding for Mars missions would also trigger huge investments for SpaceX which many of us would surely love to see.
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