Funny thing - if you look at picture in this thread there is another rock with sort of similar "scratches" to the left of the tracks.
And i assume that rock in OP is the one to the top of the track, yes? www.abovetopsecret.com...
Maybe Curiosity scratched those as it drove by. Or maybe it is some kind of fossils .
I do not see how something else could hve scratched those rocks.
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