New Mars images shows 'fingernail' gouging-like features on surface

We already know there is a Martian crater , Airy-O, which looks just like a human fingerprint. It is only logical there should be fingernail grooves. I am going over to HiRise repository to search for footprints and nail clippings. Wish me luck.
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These are thought to be grabens, "stretch marks" in the surface surrounding a growing volcano. As the volcano builds, magma is withdrawn from below, the volcano ends up sitting in a depression. The sloped walls of the depression slide towards the volcano creating cracks that define blocks that drop down making the grabens.