If I am bored I'll have a look at these, seeing what people are working themselves into a froth about this week. Last night, however, I came across one that really does defy any explanation as to what it could be. If I was shown a picture of this in a desert on Earth, I'd say it was either a plant or a grave marking. I really can't see any explanation fo it being a geological feature. If you have any suggestions, I'd be keen to hear them.
|Close up from NASA rover image
The picture was taken by the Rover on 2016-09-04 01:15:16 UTC
I'm quite surprised that there hasn't been more comment. To me it looks like an old wooden cross with lichens growing on it, with a ring of stones. Whatever it may be, I find it fascinating