It seems to be flat, and it's certainly colorful, but what exactly is it? Answer that question and you'll know how it came to be.
Bonus points if you know where it is.
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John, you're close enough. The exact wording I was hoping for were the type of rock having been given a coat of "glacial polish." I'll provide more details tomorrow when I "reveal" the photo.
As for its location, no, not Glacier.