Some good comments in the first half. if you had only stopped there...

I agree that there is a layer on the face of the rock that looks "ready" to flake off, although it may actually be a long way from coming loose.

In desert areas, a lot of weathering occurs fron thermal expansion (with or without freeze-thaw action). Morning sunlight hits the chilled face of stones and they expand. Over aeons, layers flake off. On Mars, although there may be no water/ice, there is 100 C temperature difference between day and night, so plenty of scope for thermal flaking.

The big problem with your analysis, is that there is no evidence that this rock has intrinsic internal layering. That flake is parallel to one surface (I wonder if that's the "morning" surface?). If it were a layered rock, you would see more traces of fractures and banding parallel to that flake, but you don't.

The rock looks like a fine-grained basalt. No evidence that it was transported in by a flood. It could equally well be a lava flow or a welded ashfall that was later fragmented by an impact, ejected, and then sat where it is weathering for a billion years.

Look at how all the other nearby rocks share similar face angles - they are all ventifacts, carved into wedges, pyramids, and polyhedrons by the vagaries of wind and time...

Oh, and aeolian sandstones have bedding too...

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