Help ID tooled rock

[goldandbill]

I found this piece of tooled mudstone in an area known for ealy Amerindians- it looks like maybe artwork, any ideas out there??

 

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[tatswell]

Possibly artwork- which would be a hell of a find. Either that or you have a great imagination. Or both
Nonetheless can you upload a better detailed pic?

 

[goldandbill]

OK I took a pic after dusting it with baking powder.

 

[Bajahunter]

I don't see any pattern. Not even like a well worn petroglyph.
I think it is natural.
Very nice way to highlight the marks you want to show though.